Accrued Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Payables and Accruals [Abstract]
Accrued payroll and benefits	$ 8,208	$ 6,474
Product warranty, current	1,683	2,669
Income tax payable	155	258
Other accrued expenses	1,559	1,307
Total accrued liabilities	$ 11,605	$ 10,708