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Summary of Significant Accounting Policies - Product Warranty (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Summary of product warranty activity    
Beginning balance $ 1,812 $ 2,194
Charges to expense 457 1,091
Costs incurred (1,090) (1,473)
Ending balance $ 1,179 $ 1,812