Quarterly report pursuant to Section 13 or 15(d)

Net Loss per Common Share - Anti-Dilutive Securities (Details)

v3.21.2
Net Loss per Common Share - Anti-Dilutive Securities (Details) - shares
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive securities excluded from computation of earnings per share (in shares) 15,792,000 12,651,000
Stock options    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive securities excluded from computation of earnings per share (in shares) 14,778,000 10,961,000
Warrants    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive securities excluded from computation of earnings per share (in shares) 1,014,000 1,690,000