Annual report pursuant to Section 13 and 15(d)

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

v3.20.1
Income Taxes - Components of Deferred Tax Assets and Liabilities (Detail) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets:      
Net operating loss carryovers $ 56,646,542 $ 49,294,211  
Share-based compensation 1,770,295 1,754,362  
R&D tax credits 3,149,249 2,545,920  
Accrued compensation and severance 454,128 442,090  
Deferred rent   198,278  
Lease liability 1,101,248    
Intangible assets 110,178 131,503  
Total deferred tax assets 63,231,640 54,366,364  
Valuation allowance (62,136,614) (54,152,886) $ (45,146,000)
Total deferred tax assets net of valuation allowance 1,095,026 213,478  
Deferred tax liabilities:      
Right-of-use asset (909,271)    
Depreciation (185,755) (213,478)  
Total deferred tax liabilities (1,095,026) (213,478)  
Net deferred tax asset (liability) $ 0 $ 0