Accrued Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2018
Payables and Accruals [Abstract]
Accrued salaries, benefits and bonus	$ 25,365	$ 24,737
Accrued professional, consulting and lobbying fees	11,483	3,235
Accrued warranty expense	745	1,476	$ 1,071	$ 898
Accrued income and other taxes	18,086	3,362
Accrued inventory in transit	10,185	4,156
Other accrued expenses	8,250	8,035
Accrued liabilities	$ 74,114	$ 45,001