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Revenue - Warrant Liabilities Activity (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Movement in Standard Product Warranty Accrual [Roll Forward]  
Balance at beginning of year $ 4,646
Additions 11,047
Warranty claims charged (11,629)
Foreign currency translation gain (1)
Balance at end of year $ 4,063