Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity - Warrants (Details)

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Stockholders' Equity - Warrants (Details) - Warrants - $ / shares
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Warrants, Outstanding beginning balance 57,515 4,207,447  
Warrants, Exercised (698) (102,742)  
Warrants, Expired (44,324) (4,047,190)  
Warrants, Outstanding ending balance 12,493 57,515 4,207,447
Weighted Average Exercise Price, Nonvested beginning balance $ 5.39 $ 6.81  
Weighted Average Exercise Price Exercised 0.00 0.13  
Weighted Average Exercise Price, Expired 7.00 7.00  
Weighted Average Exercise Price, Nonvested ending balance $ 0.00 $ 5.39 $ 6.81
Weighted Average Remaining Contractual Life, outstanding (in years) 3 years 9 months 29 days 1 year 2 months 19 days 1 year 3 months