Income Taxes - Schedule of Significant Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Deferred tax assets, Accounts receivable	$ 287	$ 215
Deferred tax assets, Inventories	567	111
Deferred tax assets, Deferred revenue	341	187
Deferred tax assets, Accrued expenses and reserves	4,064	3,946
Deferred tax assets, Stock based compensation	2,277	2,697
Deferred tax assets, Tax credits and loss carryforwards	1,610	4,372
Deferred tax assets, Other	9	15
Total gross deferred tax assets	9,155	11,543
Less: Valuation allowance	(711)	(911)
Total deferred tax assets	8,444	10,632
Deferred tax liabilities, Property and equipment	(4,638)	(5,102)
Deferred tax liabilities, Intangibles	(2,196)	(2,550)
Deferred tax liabilities, Foreign employment tax subsidy	(1,083)	(1,178)
Deferred tax liabilities, Prepaid expenses	(881)	(914)
Deferred tax liabilities, Other	(198)	(168)
Total deferred tax liabilities	(8,996)	(9,912)
Net deferred tax assets (liabilities)	$ (552)	$ 720