Annual report pursuant to Section 13 and 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
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive securities excluded from computation of earnings per share (in shares) 4,714,545 740,583
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) 936,996 318,034
Warrants    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive securities excluded from computation of earnings per share (in shares) 3,777,549 422,549