Accrued Liabilities - Accrued Liabilities Schedule (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Payables and Accruals [Abstract]
Accrued compensation and benefits	$ 15,366	$ 17,745
Accrued warranties	2,090	2,571	$ 2,628	$ 2,594
Professional and legal fees	1,793	2,154
Taxes other than income	4,077	3,550
General services administration liability	11,886	5,267
Other accrued liabilities	2,860	5,040
Total accrued liabilities	$ 38,072	$ 36,327