Annual report pursuant to Section 13 and 15(d)

Significant Accounting Policies - Net Loss per Share (Details)

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Significant Accounting Policies - Net Loss per Share (Details) - shares
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Potentially dilutive securities that were excluded from the computation of diluted net loss per share, as they would be anti-dilutive 4,795,194 4,147,411
Warrants    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Potentially dilutive securities that were excluded from the computation of diluted net loss per share, as they would be anti-dilutive 12,493 57,515
Stock options (Note 6) [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Potentially dilutive securities that were excluded from the computation of diluted net loss per share, as they would be anti-dilutive 270,000 220,000
Unvested restricted stock    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Potentially dilutive securities that were excluded from the computation of diluted net loss per share, as they would be anti-dilutive 4,512,701 3,869,896