Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Additional Information (Detail)

v3.19.1
Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Feb. 28, 2019
Nov. 30, 2018
Aug. 31, 2018
Feb. 28, 2018
Nov. 30, 2018
Feb. 28, 2019
Feb. 28, 2018
May 31, 2019
May 31, 2018
Dec. 31, 2017
Nov. 08, 2018
Jun. 07, 2018
Aug. 24, 2017
Aug. 23, 2017
Apr. 30, 2010
Summary Of Significant Accounting Policies [Line Items]                              
Net loss $ (12,573,811) $ (14,305,381) $ (14,413,569) $ (17,950,100)   $ (41,292,761) $ (40,526,058)                
Accumulated (deficit) (214,432,156)         (214,432,156)     $ (173,139,396)            
Balance in excess of federally insured limits 1,300,000         1,300,000     $ 1,100,000            
Impairment charges           0 0                
Pre-launch inventory qualified for capitalization $ 0         $ 0                  
Estimated future unvested forfeitures         0.00%                    
Common stock, shares authorized 600,000,000         600,000,000     375,000,000     450,000,000 375,000,000 350,000,000 100,000,000
Treasury stock, par value                 $ 0.001            
Treasury stock, shares                 159,011            
Amortization of discount on convertible notes $ 559,383     493,022   $ 676,917 1,666,017                
Amortization of debt issuance costs           $ 676,917 435,609                
Federal statutory income tax rate, percent           21.00%       35.00%          
Effective income tax rate reconciliation, at blended income tax rate, percent           28.62%                  
Tax cuts and jobs act of 2017, incomplete accounting, change in tax rate, deferred tax liability, provisional income tax benefit                 $ 17,497,051            
Deferred income tax benefit           $ (2,826,919) $ 0                
Derivative Liability 2,826,919         $ 2,826,919                  
Common stock options and warrants to purchase           175,043,638 130,457,331                
Interest Expense 1,050,413     $ 3,069,189   $ 2,955,386 $ 5,531,238                
Convertible Notes Payable [Member]                              
Summary Of Significant Accounting Policies [Line Items]                              
Interest Expense 100,000         600,000                  
Scenario, Forecast [Member] | Prostagene Llc [Member]                              
Summary Of Significant Accounting Policies [Line Items]                              
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent               21.00%              
Equity Securities                              
Summary Of Significant Accounting Policies [Line Items]                              
Deferred offering costs 3,300,000         3,300,000     3,500,000            
Short-Term Convertible Notes                              
Summary Of Significant Accounting Policies [Line Items]                              
Debt discount 0         0     0            
Direct costs associated with the convertible notes           1,000,000     400,000            
Amortization of debt issuance costs           200,000 400,000                
Short-Term Convertible Notes | Detachable Common Stock Warrants                              
Summary Of Significant Accounting Policies [Line Items]                              
Debt discount $ 4,200,000         4,200,000     $ 1,500,000            
Amortization of discount on convertible notes           $ 700,000 $ 1,600,000                
Series B Convertible Preferred Stock                              
Summary Of Significant Accounting Policies [Line Items]                              
Preferred Stock Shares authorized to be issued 400,000         400,000     400,000            
Common stock options and warrants to purchase 92,100         92,100     92,100            
Common shares issued upon conversion of preferred stock           921,000                  
Maximum                              
Summary Of Significant Accounting Policies [Line Items]                              
Common stock, shares authorized                     600,000,000        
Preferred Stock Shares authorized to be issued 5,000,000         5,000,000                  
Minimum                              
Summary Of Significant Accounting Policies [Line Items]                              
Common stock, shares authorized                     450,000,000