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Share-based Compensation - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended
Aug. 28, 2019
Jan. 16, 2019
Sep. 05, 2018
Oct. 28, 2019
Mar. 31, 2020
Mar. 31, 2019
Apr. 17, 2020
Mar. 22, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Amortization of share based compensation expense         $ 2,221 $ 274    
Restricted Stock Units (RSUs)                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Unrecognized share-based compensation costs in respect of granted RSUs         $ 12,654      
Unrecognized share-based compensation remaining weighted average period         2 years      
2018 Stock Incentive Plan                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Number of common stock authorized             4,500,000 3,000,000
Common stock available for future issuance         44,624      
2018 Stock Incentive Plan | Performance Based Restricted Stock Units                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Amortization of share based compensation expense         $ 971      
2018 Stock Incentive Plan | Performance Based Restricted Stock Units | Employees and Directors                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Restricted stock units granted   90,000 1,487,500          
Grant date fair value per share   $ 7.25 $ 7.69          
Vesting period   3 years 3 years          
Gross revenue threshold limit for vesting of grants     $ 7,000          
2018 Stock Incentive Plan | Performance Based Restricted Stock Units | Employees                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Restricted stock units granted 681,000     681,000        
Grant date fair value per share $ 11.42     $ 16.42        
Amortization of share based compensation expense         $ 1,389      
2018 Stock Incentive Plan | Performance Based Restricted Stock Units | Employees | Minimum                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Restricted stock units granted 256,000     256,000        
Vesting period 3 years     3 years        
Gross revenue threshold limit for vesting of grants $ 10,000     $ 10,000        
Positive adjusted EBITDA threshold limit for vesting of grants $ 1,500     $ 1,500        
2018 Stock Incentive Plan | Performance Based Restricted Stock Units | Employees | Maximum                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Restricted stock units granted 425,000     425,000        
Vesting period 4 years     4 years        
Gross revenue threshold limit for vesting of grants $ 12,500     $ 12,500        
Positive adjusted EBITDA threshold limit for vesting of grants $ 2,000     $ 2,000