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Accrued Warranty (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Product Warranties Disclosures [Abstract]      
Balance at beginning of year $ 4,510 $ 4,835 $ 3,142
Provision charged to cost of revenue 2,360 3,111 3,169
Warranty liabilities acquired from acquisitions 142   1,307
Use of provision (1,282) (3,341) (2,857)
Foreign currency exchange rate changes 26 (95) 74
Balance at end of year $ 5,756 $ 4,510 $ 4,835