Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity - Summary of Stock Options (Details)

v3.20.4
Stockholders' Equity - Summary of Stock Options (Details) - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Equity [Abstract]    
Number of Options, Beginning Balance 1,731,745 1,466,520
Number of Options, Granted   275,000
Number of Options, Cancelled (1,587,500)  
Number of Options, Exercised (25,000)  
Number of Options, Expired (13,125) (9,775)
Number of Options, Ending Balance 106,120 1,731,745
Number of Options Vested and Expected to Vest 106,120 1,731,745
Number of Options Vested and Exercisable 106,120 1,594,245
Weighted Average Exercise Price, Beginning Balance $ 5.50 $ 6.66
Weighted Average Exercise Price, Granted   2.04
Weighted Average Exercise Price, Cancelled 2.28  
Weighted Average Exercise Price, Exercised 2.04  
Weighted Average Exercise Price, Expired 83.62 82.05
Weighted Average Exercise Price, Ending Balance 44.32 5.50
Weighted Average Exercise Price, Options vested and expected to vest 44.32 5.50
Weighted Average Exercise Price, Options vested and exercisable $ 44.32 $ 5.80
Weighted Average Remaining Contractual Life (in years), Beginning Balance 7 years 11 months 1 day 9 years 5 months 27 days
Weighted Average Remaining Contractual Life (in years), Granted   4 years 9 months 22 days
Weighted Average Remaining Contractual Life (in years), Cancelled 0 years  
Weighted Average Remaining Contractual Life (in years), Exercised 0 years  
Weighted Average Remaining Contractual Life (in years), Expired 0 years 0 years
Weighted Average Remaining Contractual Life (in years), Ending Balance 4 years 3 months 11 days 7 years 11 months 1 day
Weighted Average Remaining Contractual Life (in years), Options vested and expected to vest 4 years 3 months 11 days 7 years 11 months 1 day
Weighted Average Remaining Contractual Life (in years), Options vested and exercisable 4 years 3 months 11 days 8 years 2 months 16 days