Annual report pursuant to Section 13 and 15(d)

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

v3.21.1
Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Deferred tax assets:      
Research and development tax credits $ 8,371,302 $ 7,390,441  
Net operating loss carryovers 57,563,810 47,460,988  
Property and equipment 219,461 241,000  
Research and development costs 12,578,612 15,083,114  
Start-up and organizational costs 540 618  
Stock-based compensation 4,041,136 3,420,667  
Operating lease liability 245,811 594,507  
Other accruals 270,912 276,512  
Total gross deferred tax assets 83,291,584 74,467,847  
Less: valuation allowance (82,929,675) (73,892,063) $ (63,349,287)
Total deferred tax assets 361,909 575,784  
Deferred tax liabilities:      
Operating lease right-of-use asset (361,909) (575,784)  
Total deferred tax liabilities (361,909) (575,784)  
Total deferred taxes, net $ 0 $ 0