Quarterly report pursuant to Section 13 or 15(d)

Common Stock Warrants (Details)

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Common Stock Warrants (Details) - $ / shares
3 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Warrants    
Warrant outstanding (in shares) 11,177 19,426
Common stock warrant, Exercise Price $15.40 per share, Issued February 2016    
Warrants    
Exercise price of warrants (in dollars per share)   $ 15.40
Warrant outstanding (in shares)   8,249
Exercise of warrant 4,917  
Common stock warrant, Exercise price $23.69 per share, Issued May 2018    
Warrants    
Exercise price of warrants (in dollars per share) $ 23.69 $ 23.69
Warrant outstanding (in shares) 6,332 6,332
Common stock warrant, Exercise price $14.71 per share, Issued March 2019    
Warrants    
Exercise price of warrants (in dollars per share) $ 14.71 $ 14.71
Warrant outstanding (in shares) 4,845 4,845