Significant Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred tax assets:
Losses	$ 9,385	$ 9,407
Compensation related deductions	4,780	3,687
Inventories	4,170	3,400
Tax credits	2,785	2,594
Unrealized currency gains/losses		183
Restructuring related liabilities	202	172
Warranty	35	768
Other	885
Total deferred tax assets	22,242	20,211
Valuation allowance on deferred tax assets	(12,884)	(12,811)
Net deferred tax assets	9,358	7,400
Deferred tax liabilities:
Depreciation	(1,867)	(1,353)
Amortization	(20,258)	(23,496)
Unrealized currency gains/losses	(373)
Other		(1,171)
Total deferred tax liabilities	(22,498)	(26,020)
Net deferred income tax (liabilities)	$ (13,140)	$ (18,620)