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Net Loss Per Share - Summary of Potentially Dilutive Securities (Details) - shares
shares in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Potentially dilutive securities not included in the calculation of diluted net loss per share 1,147 1,454 1,252 1,673
Stock Options and Restricted Stock        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Potentially dilutive securities not included in the calculation of diluted net loss per share 1,147 1,451 1,252 1,622
Warrants Outstanding        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Potentially dilutive securities not included in the calculation of diluted net loss per share 0 3 0 51