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Loss Per Share - Schedule of Potentially Dilutive Securities Outstanding Excluded from Diluted Loss Per Share Calculation (Details) - shares
shares in Thousands
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Stock Options Outstanding    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Potentially dilutive securities outstanding excluded from diluted loss per share 1,865 2,507
Non-vested Restricted Stock Units    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Potentially dilutive securities outstanding excluded from diluted loss per share 1,289 184
Common Stock Warrants    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Potentially dilutive securities outstanding excluded from diluted loss per share 105 105