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Revenue - Remaining Performance Obligations (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of performance obligations [line items]      
Revenue $ 11,768 $ 9,807 $ 20,748
Remaining Performance Obligation      
Disclosure of performance obligations [line items]      
Revenue 1,713    
Less than 1 Year | Remaining Performance Obligation      
Disclosure of performance obligations [line items]      
Revenue 1,713    
Greater than 1 Year | Remaining Performance Obligation      
Disclosure of performance obligations [line items]      
Revenue $ 0