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Commitments and Contingencies - Changes in the Liability for Product Warranty Claim Costs (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Changes in the liability for product warranty claim costs      
Balance at beginning of period $ 1,514 $ 276 $ 339
Accruals for warranties issued during the period 578 1,742 787
Settlements (in cash or in kind) during the period (463) (504) (849)
Foreign currency translation gain (loss) 92 0 (1)
Balance at end of period $ 1,721 $ 1,514 $ 276