Quarterly report pursuant to Section 13 or 15(d)

Convertible Preferred Stock and Stockholders' Equity - Activity related to restricted stock award (Details)

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Convertible Preferred Stock and Stockholders' Equity - Activity related to restricted stock award (Details) - $ / shares
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Shares    
Granted 352,000 353,000
2020 Stock Incentive Plan    
Shares    
Non-vested as of January 1, 2021 626,974  
Granted 17,000  
Non-vested as of March 31, 2021 643,974  
Weighted-Average Grant Date Fair Value    
Non-vested as of January 1, 2021 $ 2.29  
Granted 3.89  
Non-vested as of March 31, 2021 $ 2.33  
Restricted Stock [Member]    
Shares    
Non-vested as of January 1, 2021 87,169  
Granted 643,700  
Vested 0  
Forfeited 0  
Non-vested as of March 31, 2021 730,869  
Weighted-Average Grant Date Fair Value    
Non-vested as of January 1, 2021 $ 2.26  
Granted 3.58  
Vested 0.00  
Forfeited (0.00)  
Non-vested as of March 31, 2021 $ 3.42