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Accrued Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Payables and Accruals [Abstract]        
Accrued salaries, benefits and bonus $ 39,487 $ 36,892    
Accrued professional, consulting and lobbying fees 1,201 3,055    
Accrued warranty expense 901 769 $ 1,012 $ 1,476
Accrued income and other taxes 3,780 3,848    
Accrued inventory in transit 10,979 4,597    
Other accrued expenses 10,560 10,682    
Accrued liabilities $ 66,908 $ 59,843