Income Taxes (Details 3) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred Tax Assets:
Allowance for doubtful accounts	$ 506	$ 118
Inventory reserve	619	467
Accrued expenses	664	831
Property, plant and equipment	214	317
Tax operating loss carryforwards	9,327	10,962
Tax credit carryforwards	168	254
Stock compensation	1,817	2,301
Total deferred tax assets	13,315	15,250
Less valuation allowance	(13,309)	(15,250)
Net deferred tax assets	6	0
Deferred Tax Liabilities:
Intangible assets	(165)	(205)
Total deferred tax liabilities	165	205
Net deferred tax liability	$ (159)	$ (205)