Other Accrued Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Payables and Accruals [Abstract]
Advertising and marketing	$ 304	$ 232
Deferred revenue	336	215
Deposit for sale of Guangzhou factory	0	4,901
Duties	792	1,184
Freight and handling fees	3,043	1,983
Product development	700	974
Product warranty claim costs	1,008	339
Professional fees	1,760	1,578
Property, plant, and equipment	509	2,151
Sales taxes and VAT	799	2,955
Short-term contingent consideration	3,870	3,800
Third-party commissions	535	599
Tooling	1,728	1,843
Unrealized loss on foreign currency exchange contracts	163	630
Utilities	165	103
Other	5,338	5,232
Total other accrued liabilities	$ 21,050	$ 28,719