Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Antidilutive Securities (Details)

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Summary of Significant Accounting Policies - Antidilutive Securities (Details) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings (in shares) 56,246,305 5,757,044 46,057,794 5,757,044
Options        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings (in shares) 6,847,877 5,662,946 1,659,366 5,662,946
Warrants        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings (in shares) 49,398,428 93,252 44,398,428 93,252
Convertible preferred stock        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings (in shares) 0 846 0 846