Annual report pursuant to Section 13 and 15(d)

INCOME TAXES - Deferred Tax Assets (Details)

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INCOME TAXES - Deferred Tax Assets (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Deferred tax assets    
Federal net operating loss $ 28,261,717 $ 26,562,715
Federal research and development tax credit carryforwards 6,137,842 5,439,062
State net operating losses and tax credit carryforwards 3,590,961 1,589,926
Capitalized research and development expenses 8,955,425 5,959,275
Stock-based compensation expense 2,333,551 1,565,130
Depreciable assets 0 0
Other 292,259 103,189
Total deferred tax assets 49,571,755 41,219,297
Deferred tax liabilities    
Depreciable assets (153,928) (89,129)
Total deferred tax liabilities (153,928) (89,129)
Net deferred tax assets 49,417,827 41,130,168
Less- valuation allowance (49,417,827) (41,130,168)
Total deferred tax assets $ 0 $ 0