Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Warrants Outstanding (Details)

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Stockholders' Equity - Warrants Outstanding (Details) - $ / shares
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Equity [Abstract]      
Warrants outstanding (in shares) 422,549 422,549 15,277
Exercise price of warrants (in dollars per share) $ 0.11 $ 0.11 $ 2.75
Weighted average remaining life 1 year 4 months 13 days 2 years 1 month 13 days