Stock Options and Warrants - Additional Information (Detail) - USD ($)
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1 Months Ended |
3 Months Ended |
9 Months Ended |
12 Months Ended |
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Feb. 28, 2018 |
Jan. 31, 2018 |
Jan. 23, 2018 |
Nov. 30, 2017 |
Nov. 24, 2017 |
Oct. 11, 2017 |
Sep. 08, 2017 |
Jun. 14, 2017 |
Feb. 28, 2017 |
Jan. 31, 2017 |
Dec. 12, 2016 |
Sep. 30, 2016 |
Feb. 28, 2018 |
Feb. 28, 2017 |
Feb. 28, 2018 |
Feb. 28, 2017 |
May 31, 2017 |
Aug. 24, 2017 |
Jun. 19, 2017 |
Mar. 31, 2016 |
Feb. 28, 2015 |
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock options grant date fair value |
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$ 0.25
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| Inducement interest related to convertible notes |
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$ 2,352,045
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$ 2,352,045
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| Common Stock issued |
208,904,000
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208,904,000
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208,904,000
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149,468,244
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| Proceeds from Issuance of Common Stock |
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$ 8,990,000
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| Inducement interest related to warrant extensions |
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$ 72,437
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826,252
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$ 72,437
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| Compensation expense |
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$ 1,096,226
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$ 984,772
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| Convertible Notes 2017 |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Warrants to purchase common shares, shares |
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383,333
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| Minimum | Convertible Notes 2017 |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Exercise price of warrants |
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$ 1.00
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| Warrant covering common stock shares purchased, percentage |
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25.00%
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| Maximum | Convertible Notes 2017 |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Exercise price of warrants |
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$ 1.35
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| Warrant covering common stock shares purchased, percentage |
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50.00%
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| Placement Agent |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Warrants to purchase common shares, shares |
350,766
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245,681
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150,461
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213,573
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453,652
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122,799
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1,066,667
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350,766
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453,652
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350,766
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453,652
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| Term of warrants |
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5 years
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5 years
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5 years
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5 years
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5 years
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5 years
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5 years
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| Exercise price of warrants |
$ 0.825
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$ 0.55
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$ 0.715
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$ 0.825
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$ 0.825
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$ 0.825
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$ 0.825
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$ 0.825
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$ 0.825
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$ 0.825
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$ 0.825
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| Investor |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Exercise price of warrants |
$ 0.50
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$ 0.75
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$ 0.50
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$ 0.50
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| Common Stock issued |
3,295,000
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3,295,000
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3,295,000
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| Proceeds from Issuance of Common Stock |
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$ 1,600,000
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| Investor | 2013 Convertible Notes | Detachable Common Stock Warrants |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Exercise price of warrants |
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$ 0.75
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| Inducement interest related to convertible notes |
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$ 2,400,000
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| Investor | Minimum | 2013 Convertible Notes | Detachable Common Stock Warrants |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Exercise price of warrants |
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$ 0.75
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| Investor | Maximum | 2013 Convertible Notes | Detachable Common Stock Warrants |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Exercise price of warrants |
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$ 1.00
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| Subscription Agreements |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Warrants to purchase common shares, shares |
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7,718,010
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3,071,014
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940,380
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1,668,163
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2,835,323
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767,498
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2,835,323
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2,835,323
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| Term of warrants |
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5 years
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5 years
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5 years
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5 years
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5 years
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5 years
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| Exercise price of warrants |
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$ 0.75
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$ 0.75
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$ 0.75
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$ 1.00
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$ 1.00
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$ 1.00
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$ 1.00
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$ 1.00
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| Proceeds from Issuance of Common Stock |
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$ 1,400,000
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$ 1,100,000
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$ 2,300,000
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$ 3,800,000
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$ 1,000,000
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| Securities Purchase Agreement |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Warrants to purchase common shares, shares |
3,258,990
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2,000,000
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6,666,667
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3,258,990
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3,258,990
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| Term of warrants |
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5 years
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5 years
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5 years
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| Exercise price of warrants |
$ 1.00
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$ 1.00
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$ 1.00
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$ 1.00
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$ 1.00
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| Proceeds from Issuance of Common Stock |
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$ 3,000,000
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$ 9,000,000
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| Make-Whole Securities |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Warrants to purchase common shares, shares |
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251,504
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| Term of warrants |
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5 years
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| Exercise price of warrants |
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$ 0.75
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| Make-Whole Securities | Placement Agent |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Warrants to purchase common shares, shares |
26,702
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26,702
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26,702
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26,702
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| Term of warrants |
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5 years
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| Exercise price of warrants |
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$ 0.715
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$ 0.715
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| Before Inducement | Investor |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Exercise price of warrants |
$ 1.00
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$ 1.00
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$ 1.00
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| Class of warrant or right expiration date |
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Jun. 30, 2017
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| Private Equity Offering |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Warrants to purchase common shares, shares |
35,286,904
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35,286,904
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35,286,904
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| Term of warrants |
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5 years
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5 years
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| Exercise price of warrants |
$ 0.75
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$ 0.75
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$ 0.75
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$ 1.00
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| Warrant covering common stock shares purchased, percentage |
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100.00%
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25.00%
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| Private Equity Offering | Placement Agent |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Warrants to purchase common shares, shares |
2,813,491
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2,813,491
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2,813,491
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| Term of warrants |
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5 years
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| Exercise price of warrants |
$ 0.55
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$ 0.55
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$ 0.55
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| 2012 Equity Incentive Plan |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Compensation expense |
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$ 567,000
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$ 297,000
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$ 1,096,000
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$ 985,000
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| Grant date fair value of options and warrants |
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763,000
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$ 231,000
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1,337,000
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$ 762,000
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| Unrecognized compensation expense |
$ 800,000
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$ 800,000
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$ 800,000
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| 2012 Equity Incentive Plan | Employee Stock Option One | Directors |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock options granted, shares |
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450,000
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| Stock options granted, exercise price |
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$ 0.57
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| Stock options grant date fair value |
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$ 0.36
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| 2012 Equity Incentive Plan | Employee Stock Option One | Directors | Minimum |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Vesting period |
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1 year
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| 2012 Equity Incentive Plan | Employee Stock Option One | Directors | Maximum |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Vesting period |
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10 years
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| 2012 Equity Incentive Plan | Stock Options |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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|
|
|
|
|
|
|
|
|
|
|
|
|
| Shares available for future stock-based grants |
4,869,397
|
|
|
|
|
|
|
|
|
|
|
|
4,869,397
|
|
4,869,397
|
|
|
|
|
|
|
| 2012 Equity Incentive Plan | Stock Options | Before Amendment |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Shares available for future issuance |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
7,000,000
|
|
5,000,000
|
3,000,000
|
| 2012 Equity Incentive Plan | Stock Options | After Amendment |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Shares available for future issuance |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
15,000,000
|
|
7,000,000
|
5,000,000
|
| 2012 Equity Incentive Plan | Stock Options | Chief Science Officer |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Stock options granted, shares |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
600,000
|
|
|
|
|
|
|
| Stock options granted, exercise price |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
$ 0.57
|
|
|
|
|
|
|
| Vesting period |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
3 years
|
|
|
|
|
|
|
| Stock options grant date fair value |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
$ 0.35
|
|
|
|
|
|
|
| Stock options, term |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
10 years
|
|
|
|
|
|
|
| 2012 Equity Incentive Plan | Stock Options | Executive Management and Employees |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Stock options granted, shares |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
800,000
|
|
|
|
|
|
|
| Vesting period |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
3 years
|
|
|
|
|
|
|
| Stock options grant date fair value |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
$ 0.35
|
|
|
|
|
|
|
| Stock options, term |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
10 years
|
|
|
|
|
|
|
| Stock options granted, exercise price, lower range limit |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
$ 0.57
|
|
|
|
|
|
|
| 2012 Equity Incentive Plan | Employee Stock Option Two | Directors |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Stock options granted, shares |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
836,055
|
|
|
|
|
|
|
| Stock options granted, exercise price |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
$ 0.56
|
|
|
|
|
|
|
| Vesting period |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
10 years
|
|
|
|
|
|
|
| Stock options grant date fair value |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
$ 0.31
|
|
|
|
|
|
|
| 2012 Equity Incentive Plan | Stock Replacement Option | Executive Management and Directors |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Stock options granted, shares |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
1,050,000
|
|
|
|
|
|
|
| Stock options granted, exercise price |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
$ 0.80
|
|
|
|
|
|
|
| Vesting period |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
5 years
|
|
|
|
|
|
|
| Stock options grant date fair value |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
$ 0.42
|
|
|
|
|
|
|
| Stock options, term |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
10 years
|
|
|
|
|
|
|
| Non-cash stock based compensation expense |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
$ 321,000
|
|
|
|
|
|
|
| 2012 Equity Incentive Plan | Warrants (equity allocation) | Consultant 1 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Vesting period |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
5 years
|
|
|
|
|
|
|
| Warrants granted, shares |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
200,000
|
|
|
|
|
|
|
| Warrants granted, exercise price |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
$ 0.64
|
|
|
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
25.00%
|
|
|
|
|
|
|
| Warrants grant date fair value |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
$ 0.26
|
|
|
|
|
|
|
| 2012 Equity Incentive Plan | Warrants (equity allocation) | Consultant 2 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Vesting period |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
5 years
|
|
|
|
|
|
|
| Warrants granted, shares |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
100,000
|
|
|
|
|
|
|
| Warrants granted, exercise price |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
$ 0.75
|
|
|
|
|
|
|
| Warrants grant date fair value |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
$ 0.29
|
|
|
|
|
|
|
| 2012 Equity Incentive Plan | Warrants (equity allocation) | Consultant Three [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Vesting period |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
5 years
|
|
|
|
|
|
|
| Warrants granted, shares |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
50,000
|
|
|
|
|
|
|
| Warrants granted, exercise price |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
$ 0.76
|
|
|
|
|
|
|
| Warrants grant date fair value |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
$ 0.26
|
|
|
|
|
|
|
| 2012 Equity Incentive Plan | Warrants (equity allocation) | December 31, 2017 | Consultant 1 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
25.00%
|
|
|
|
|
|
|
| 2012 Equity Incentive Plan | Warrants (equity allocation) | Milestone | Consultant 1 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
50.00%
|
|
|
|
|
|
|
| Offer to Amend and Exercise |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Warrants to purchase common shares, shares |
|
|
|
|
51,090,113
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Exercise price of warrants |
|
|
|
|
$ 0.50
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Class of warrant or right expiration date |
Dec. 22, 2017
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Offer to Amend and Exercise | Minimum |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Exercise price of warrants |
|
|
|
|
$ 0.50
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Expiration of tender offer |
|
|
|
|
2018-10
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Offer to Amend and Exercise | Maximum |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Exercise price of warrants |
|
|
|
|
$ 1.35
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Expiration of tender offer |
|
|
|
|
2022-10
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|