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Basic and Diluted Loss Per Share - Anti-dilutive shares (Details) - shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Warrants      
Antidilutive Securities Excluded From Computation Of Earnings Per Share Line Items1 Line Items      
Anti-dilutive shares 2,228,076 2,059,128 1,674,324
Convertible Debt 1      
Antidilutive Securities Excluded From Computation Of Earnings Per Share Line Items1 Line Items      
Anti-dilutive shares     302,976
Convertible Debt 2      
Antidilutive Securities Excluded From Computation Of Earnings Per Share Line Items1 Line Items      
Anti-dilutive shares     827,856