Quarterly report pursuant to Section 13 or 15(d)

Condensed Consolidated Financial Statement Detail - Outstanding Securities Considered Anti-Dilutive (Details)

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Condensed Consolidated Financial Statement Detail - Outstanding Securities Considered Anti-Dilutive (Details) - shares
shares in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Antidilutive Securities Excluded From Computation Of Earnings Per Share    
Antidilutive securities excluded from computation of net loss per share (in shares) 5,706 5,285
Convertible preferred stock    
Antidilutive Securities Excluded From Computation Of Earnings Per Share    
Antidilutive securities excluded from computation of net loss per share (in shares) 5,003 5,003
Stock Options    
Antidilutive Securities Excluded From Computation Of Earnings Per Share    
Antidilutive securities excluded from computation of net loss per share (in shares) 697 277
Warrants for Common Stock [Member]    
Antidilutive Securities Excluded From Computation Of Earnings Per Share    
Antidilutive securities excluded from computation of net loss per share (in shares) 6 5