Annual report pursuant to Section 13 and 15(d)

Income Taxes - Schedule of Effective Income Tax Rate (Details)

v3.21.1
Income Taxes - Schedule of Effective Income Tax Rate (Details)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Income Tax Disclosure [Abstract]    
U. S. federal statutory tax rate (21.00%) (21.00%)
State income taxes, net of federal tax benefit (6.00%) (6.00%)
Expirations related to stock-based compensation 0.50% 1.20%
Adjustment to deferred tax asset (0.80%) (0.30%)
Change in valuation allowance 27.30% 26.10%
Effective tax rate 0.00% 0.00%