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Stock-Based Compensation - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Sep. 17, 2018
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Stock-based compensation expense   $ 492 $ 1,441 $ 1,138 $ 1,672
Number of incentive stock option granted       53,683  
Weighted average grant-date fair value of stock options granted   $ 3.38   $ 3.30  
Restricted Stock          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Number of shares granted       64,016 2,141,445
Stock-based compensation expense   $ 500 $ 1,400 $ 1,100 $ 1,700
Weighted average grant-date fair value of restricted stock       $ 3.19  
Unrecognized stock-based compensation cost   $ 5,100   $ 5,100  
Weighted average period of cost expected to be recognized       2 years 9 months 18 days  
Stock Options          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Vesting period       4 years  
Number of incentive stock option granted       53,683 0
Stock options contractual term       10 years  
2018 Plan          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Number of shares available for grant 7,033,971 7,033,971   7,033,971  
Vesting period 4 years        
Unvested restricted stock units and stock option outstanding   3,856,978   3,856,978  
Shares available for grant   375,093   375,093