Annual report pursuant to Section 13 and 15(d)

11. INCOME TAXES (Tables)

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11. INCOME TAXES (Tables)
 12 Months Ended
Dec. 31, 2019
Income Tax Disclosure [Abstract]  
Schedule of reconciliation of income taxes
    Year Ended December 31,
    2019   2018
Benefit at U.S. federal statutory rate   $ (10,138,657 )   $ (13,806,124 )
State taxes - deferred     (2,010,517 )     (1,443,538 )
Increase in valuation allowance     11,790,031       (1,015,582 )
Research and development credits     (115,086 )     (223,735 )
Decrease in federal net operating loss     —         12,090,203  
Decrease in federal research and development credits     —         4,294,344  
Other     474,229       104,432  
Benefit for income taxes   $ —       $ —    
Schedule of deferred tax asset
    Year Ended December 31,
    2019   2018
Federal and state net operating loss carryforwards   $ 42,496,374     $ 26,080,351  
Federal and state research credits     630,516       525,248  
Interest expense limitation carryforwards     —         1,159,422  
Transaction costs     1,174,733       1,147,581  
Deferred revenue     603,535       624,610  
Accrued expenses and other     2,433,142       6,011,057  
Total gross deferred tax assets     47,338,300       35,548,269  
Less: valuation allowance for deferred tax assets     (47,338,300 )     (35,548,269 )
Net deferred tax assets   $ —       $ —