Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Warrants (Details)

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Stockholders' Equity - Warrants (Details) - Warrants - $ / shares
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Warrants, Outstanding beginning balance 57,515  
Warrants, Expired (44,324)  
Warrants, Outstanding ending balance 13,191 57,515
Weighted Average Exercise Price, Nonvested beginning balance $ 5.39  
Weighted Average Exercise Price, Expired 7.00  
Weighted Average Exercise Price, Nonvested ending balance $ 0.00 $ 5.39
Weighted Average Remaining Contractual Life, outstanding (in years) 4 years 29 days 1 year 2 months 19 days