Other Accrued Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Payables and Accruals [Abstract]
Advertising and marketing	$ 270	$ 232
Deferred revenue	427	215
Deposit for sale of Guangzhou factory	5,080	4,901
Duties	698	1,184
Freight and handling fees	2,334	1,983
Product development	1,272	974
Product warranty claim costs	239	339
Professional fees	1,815	1,578
Property, plant, and equipment	1,689	2,151
Sales taxes and VAT	2,597	2,955
Short-term contingent consideration	3,231	3,800
Third-party commissions	633	599
Tooling	2,070	1,843
Unrealized loss on foreign currency exchange contracts	581	630
Utilities	256	103
Other	5,919	5,232
Total other accrued liabilities	$ 29,111	$ 28,719