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Net Loss Per Share - Summary of Potentially Dilutive Securities (Details) - shares
shares in Thousands
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]        
Potentially dilutive securities not included in the calculation of diluted net loss per share 1,311 1,898 1,345 1,813
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 1,307 1,847 1,318 1,762
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 4 51 25 51
Employee Stock Purchase Plan Shares        
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 0 2 0