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
Jun. 30, 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