Quarterly report pursuant to Section 13 or 15(d)

Net Loss Per Share - Anti-dilutive Securities (Details)

v3.21.1
Net Loss Per Share - Anti-dilutive Securities (Details) - shares
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Jan. 31, 2021
Dec. 31, 2018
Anti-dilutive securities        
Number of shares available under warrant (in shares)       4,000,000
Nantahala        
Anti-dilutive securities        
Number of shares available under warrant (in shares)     1,676,923  
Stock options        
Anti-dilutive securities        
Anti- dilutive securities excluded from the computation of diluted weighted shares outstanding (in shares) 12,944,891 7,712,680    
Warrants on common stock        
Anti-dilutive securities        
Anti- dilutive securities excluded from the computation of diluted weighted shares outstanding (in shares) 4,002,380 4,024,708    
Restricted Stock Units        
Anti-dilutive securities        
Anti- dilutive securities excluded from the computation of diluted weighted shares outstanding (in shares) 155,833 267,500    
Underwriters’ unit purchase option        
Anti-dilutive securities        
Anti- dilutive securities excluded from the computation of diluted weighted shares outstanding (in shares) 0 40,000