Annual report pursuant to Section 13 and 15(d)

Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail)

v3.20.1
Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets:      
Research and development tax credits $ 7,390,441 $ 5,994,401  
Net operating loss carryovers 47,460,988 36,578,319  
Property and equipment 241,000 144,833  
Research and development costs 15,083,114 16,303,445  
Start-up and organizational costs 618 696  
Stock-based compensation 3,420,667 4,000,781  
Operating lease liability 594,507    
Other accruals 276,512 326,812  
Total gross deferred tax assets 74,467,847 63,349,287  
Less: valuation allowance (73,892,063) (63,349,287) $ (46,171,964)
Total deferred tax assets 575,784    
Deferred tax liabilities:      
Operating lease right-of-use asset (575,784)    
Total deferred tax liabilities (575,784)    
Total deferred taxes, net $ 0 $ 0