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Share Based Payments - Summary of Stock Based Compensation Expense is Classified in Consolidated Statement of Operations and Comprehensive Loss (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]    
Share-based compensation expense $ 2,529 $ 4,691
Research and Development    
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]    
Share-based compensation expense 933 898
Cost of Sales    
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]    
Share-based compensation expense (1)  
General and Administrative    
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]    
Share-based compensation expense $ 1,597 $ 3,793