Registered Direct Equity Offerings - Additional Information (Detail) - USD ($)
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1 Months Ended |
12 Months Ended |
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May 22, 2018 |
Mar. 23, 2018 |
Feb. 01, 2018 |
Jan. 31, 2018 |
Jan. 30, 2018 |
Jan. 23, 2018 |
Nov. 30, 2017 |
Oct. 11, 2017 |
Sep. 08, 2017 |
Feb. 28, 2017 |
Jan. 31, 2017 |
Dec. 12, 2016 |
Sep. 30, 2016 |
May 31, 2018 |
May 31, 2017 |
May 31, 2016 |
Nov. 24, 2017 |
Sep. 21, 2015 |
Stockholders Equity Note [Line Items] |
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Warrants to purchase common shares, shares |
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3,027,263
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Proceeds from issuance of common shares |
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$ 8,990,000
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Warrants issued included in closing costs |
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1,066,667
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Fair value of placement agent warrants |
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$ 819,200
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Proceeds allocated to financing expense |
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241,986
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Issuance cost incurred |
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577,214
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Gross proceeds from issuance of common stock |
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25,224,212
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$ 19,133,755
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$ 37,569,964
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Stock repurchased during period, value |
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259,157
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789,140
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Inducement interest related to convertible notes |
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2,352,045
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1,194,887
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Common stock issued |
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$ 104,546
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Investor |
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Stockholders Equity Note [Line Items] |
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Class of warrants, exercise price |
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$ 0.50
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Proceeds from issuance of common shares |
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$ 1,600,000
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Common Stock |
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Stockholders Equity Note [Line Items] |
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Number of shares to be sold |
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310,526
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Common stock issued |
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$ 311
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Offer to Amend and Exercise |
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Stockholders Equity Note [Line Items] |
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Warrants to purchase common shares, shares |
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51,090,113
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Class of warrants, exercise price |
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$ 0.50
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Offer to Amend and Exercise | Minimum |
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Stockholders Equity Note [Line Items] |
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Class of warrants, exercise price |
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0.50
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Offer to Amend and Exercise | Maximum |
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Stockholders Equity Note [Line Items] |
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Class of warrants, exercise price |
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1.35
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Short-Term Convertible Notes |
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Stockholders Equity Note [Line Items] |
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Purchase price, per share |
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$ 0.50
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Warrants to purchase common shares, shares |
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7,718,010
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Class of warrants, exercise price |
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$ 0.75
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Term of warrants |
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5 years
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Number of shares to be sold |
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12,062,728
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Gross proceeds from issuance of common stock |
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$ 6,000,000
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Debt Instrument, maturity date |
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Jan. 31, 2018
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Debt Instrument, face amount |
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$ 6,000,000
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$ 2,700,000
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Debt Instrument, accrued interest |
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300,000
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Long-term debt and capital lease obligations including current maturities |
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6,300,000
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3,981,050
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Stock repurchased during period, value |
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$ 259,000
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$ 789,000
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Percentage of warrants coverage |
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100.00%
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50.00%
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Conversion of Stock |
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$ 0.50
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$ 0.75
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Reinvestment of the principal amount per share |
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$ 0.50
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2013 Convertible Notes | Investor | Detachable Common Stock Warrants |
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Stockholders Equity Note [Line Items] |
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Inducement interest related to convertible notes |
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$ 2,400,000
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2013 Convertible Notes | Investor | Detachable Common Stock Warrants | Minimum |
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Stockholders Equity Note [Line Items] |
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Class of warrants, exercise price |
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$ 0.75
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2013 Convertible Notes | Investor | Detachable Common Stock Warrants | Maximum |
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Stockholders Equity Note [Line Items] |
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Class of warrants, exercise price |
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$ 1.00
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Placement Agent |
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Stockholders Equity Note [Line Items] |
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Warrants to purchase common shares, shares |
315,200
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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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Class of warrants, exercise price |
$ 0.55
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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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Term of warrants |
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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Percentage of shares, issued as warrants |
8.00%
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8.00%
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8.00%
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8.00%
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8.00%
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8.00%
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8.00%
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Placement Agent | Short-Term Convertible Notes |
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Stockholders Equity Note [Line Items] |
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Cash commission paid |
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$ 164,425
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Securities Purchase Agreement |
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Stockholders Equity Note [Line Items] |
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Number of shares to be sold |
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4,000,000
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13,333,334
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Purchase price, per share |
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$ 0.75
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$ 0.75
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Warrants to purchase common shares, shares |
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2,000,000
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6,666,667
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Class of warrants, exercise price |
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$ 1.00
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$ 1.00
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Term of warrants |
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5 years
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5 years
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Proceeds from issuance of common shares |
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$ 3,000,000
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$ 9,000,000
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Placement agent's fees, as a percentage of gross proceeds |
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8.00%
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Securities Purchase Agreement | Investor |
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Stockholders Equity Note [Line Items] |
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Warrants to purchase common shares, shares |
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6,666,667
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Class of warrants, exercise price |
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$ 1.00
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Term of warrants |
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5 years
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Securities Purchase Agreement | Placement Agent |
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Stockholders Equity Note [Line Items] |
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Warrants to purchase common shares, shares |
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1,066,667
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Class of warrants, exercise price |
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$ 0.825
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Term of warrants |
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5 years
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Subscription Agreements |
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Stockholders Equity Note [Line Items] |
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Number of shares to be sold |
4,640,000
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3,071,014
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1,880,765
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3,336,331
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5,670,661
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1,534,999
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Purchase price, per share |
$ 0.50
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$ 0.50
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$ 0.65
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$ 0.75
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$ 0.75
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$ 0.75
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Warrants to purchase common shares, shares |
4,640,000
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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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Class of warrants, exercise price |
$ 0.75
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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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Term of warrants |
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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Proceeds from issuance of common shares |
$ 2,100,000
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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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Placement agent's fees, as a percentage of gross proceeds |
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9.00%
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9.00%
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9.00%
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Subscription Agreements | Offer to Amend and Exercise |
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Stockholders Equity Note [Line Items] |
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Class of warrants, exercise price |
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$ 0.50
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Subscription Agreements | Warrant Holders [Member] | Offer to Amend and Exercise | Common Stock |
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Stockholders Equity Note [Line Items] |
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Common stock issued |
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$ 556,678
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Make-Whole Securities |
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Stockholders Equity Note [Line Items] |
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Number of shares to be sold |
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503,015
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Warrants to purchase common shares, shares |
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251,504
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Class of warrants, exercise price |
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$ 0.75
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Term of warrants |
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5 years
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Make-Whole Securities | Investor |
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Stockholders Equity Note [Line Items] |
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Class of warrants, exercise price |
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$ 0.75
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Make-Whole Securities | Waiver and Subscription Agreement |
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Stockholders Equity Note [Line Items] |
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Purchase price, per share |
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$ 0.65
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0.75
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Class of warrants, exercise price |
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0.75
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1.00
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Make-Whole Securities | Placement Agent |
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Stockholders Equity Note [Line Items] |
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Warrants to purchase common shares, shares |
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26,702
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26,702
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Class of warrants, exercise price |
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$ 0.715
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0.715
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Term of warrants |
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5 years
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Make-Whole Securities | Placement Agent | Waiver and Subscription Agreement |
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Stockholders Equity Note [Line Items] |
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Class of warrants, exercise price |
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$ 0.715
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$ 0.825
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