Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation - Summary of stock option activity (Details)

v3.21.1
Stock-Based Compensation - Summary of stock option activity (Details) - USD ($)
3 Months Ended 12 Months Ended
Nov. 16, 2020
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options, Exercised 0        
Stock Option [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options, Beginning Balance   3,997,418 2,502,012 2,502,012  
Options, Granted   0 0 1,540,000  
Options, Exercised   0   0  
Options, Expired   0   (14,944)  
Options, Forfeited   0   (29,650)  
Options, Ending Balance   3,997,418   3,997,418 2,502,012
Options, Exercisable   1,645,161      
Weighted Average Exercise Price, Beginning Balance   $ 2.35 $ 3.62 $ 3.62  
Weighted Average Exercise Price, Granted   0.00   0.42  
Weighted Average Exercise Price, Exercised   0.00   0.00  
Weighted Average Exercise Price, Expired   0.00   17.57  
Weighted Average Exercise Price, Forfeited   0.00   0.55  
Weighted Average Exercise Price, Ending Balance   2.35   $ 2.35 $ 3.62
Weighted Average Exercise Price, Exercisable   $ 5.10      
Weighted Average Remaining Contractual Life, Balance Outstanding   5 years 6 months 11 days   6 years 1 month 2 days 6 years 6 months 4 days
Weighted Average Remaining Contractual Life, Exercisable   4 years 6 months 7 days      
Aggregate Intrinsic Value, Ending Balance   $ 856,227   $ 0 $ 153,353
Aggregate Intrinsic Value, Exercisable   268,034      
Grant date fair value of options granted   $ 0   $ 412,000  
Weighted average grant date fair value   $ 0.00   $ 0.27