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Income Taxes - Schedule of Income Tax Provision for Federal Statutory Income Tax Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Tax (provision) at Federal statutory rate	$ (1,318)	$ (3,587)	$ (2,798)
State income tax (provision), net of federal benefit	(148)	(408)	(257)
Research and development tax credits	423	456	549
Foreign earnings or losses taxed at different rates	(292)	(231)	(102)
Other	233	280	383
Change in valuation allowance	(332)	(285)	(408)
Tax (provision)	$ (1,434)	$ (3,775)	$ (2,633)

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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