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Share-Based compensation - Additional Information (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Jun. 07, 2018
Sep. 17, 2014
Dec. 31, 2019
Dec. 31, 2018
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Share based compensation expense     $ 1.8 $ 1.4
Issuance of stock option to purchase stock     7,000,000  
Common stock reserved for issuance     77,400  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value     $ 0.7 0.0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Aggregate Intrinsic Value, Nonvested     $ 0.3 $ 0.0
Options granted     3,164,800 3,874,200
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     16,129 199,291
Employee Stock Option [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     2 years  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     3,200,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number     1,100,000  
2004 Stock Incentive Plan        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Common stock reserved for issuance   3,000,000    
Share based compensation arrangement by share based payment award percentage of fair market Person holding more then 10% voting stock   110.00%    
2018 Stock Incentive Plan        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Common stock reserved for issuance 4,000,000      
Share based compensation arrangement by share based payment award percentage of fair market Person holding more then 10% voting stock 110.00%      
Stock Option Plan        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Options granted     3,164,800 3,874,200