Income Taxes (Details 2) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Components of deferred income tax assets and liabilities [Abstract]
Loss carryforwards	$ 30,770	$ 22,640
AMT credits	112	112
Foreign tax credits	12,308	12,308
Accrued employment expenses	2,652	2,290
Amortization and write-offs	1,299	1,282
Capitalized R&D costs	1,342	1,951
Deferred revenues	6,263	6,262
Depreciation	1,224	1,216
Doubtful accounts	225	4,838
Inventory reserves	459	413
Tax on undistributed earnings	(517)	(517)
Other accruals and reserves	602	642
Return allowances	456	1,928
Gross deferred tax asset	57,195	55,365
Less: valuation allowance	(57,195)	(54,901)
Net deferred tax asset		464
Among current assets		470
Among other non-current liabilities		$ (6)