Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Net Loss Per Common Share (Details)

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Summary of Significant Accounting Policies - Net Loss Per Common Share (Details) - shares
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share (in shares) 2,502,716 660,690 2,502,716 660,690
Stock options (excluding exercisable penny stock options)        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share (in shares) 630,593 238,141 630,593 238,141
Convertible debt        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share (in shares) 1,449,574 0 1,449,574 0
Warrants        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share (in shares) 422,549 422,549 422,549 422,549