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Revenue - Capitalized Costs and Amortization (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Revenue          
Amortization period 7 years   7 years    
Capitalized costs to obtain contracts, current $ 1,764   $ 1,764   $ 1,222
Capitalized costs to obtain contracts, non-current 7,093   7,093   $ 5,464
Amortization of capitalized costs to obtain contracts $ 419 $ 251 $ 1,090 $ 620