Accrued Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Payables and Accruals [Abstract]
Payroll and related	$ 5,552	$ 6,514
Professional fees	1,185	1,284
Non-income taxes	489	483
Product warranty	587	593	$ 616	$ 578
Severance and other employee related costs	643	0
Other	739	1,098
Total accrued liabilities	$ 9,195	$ 9,972