Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Warrants (Details)

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Stockholders' Equity - Warrants (Details) - USD ($)
 12 Months Ended
Dec. 31, 2019
Sep. 30, 2021
Dec. 31, 2020
Class of Warrant or Right [Line Items]      
Warrants outstanding (in shares) 15,277 422,549 422,549
Exercise price of warrants (in dollars per share) $ 2.75 $ 0.11 $ 0.11
Period which warrants are exercisable 4 years    
Penny Warrant      
Class of Warrant or Right [Line Items]      
Warrants outstanding (in shares) 407,272    
Grant date fair value (in dollars per share) $ 0.0003    
Warrant exercise, market capitalization threshold $ 50,000,000    
Warrant exercise, market capitalization threshold period 5 days    
Warrant exercise, change of control transaction proceeds threshold $ 50,000,000    
Warrant exercise, pre-money third party investor valuation threshold $ 50,000,000    
Warrant exercise, change of control, service provider status by Company, termination period 12 months    
Warrant exercise, change of control, service provider status by Holder, termination period 12 months