Significant Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred tax assets:
Losses & IRC Section 163(j) carryforwards	$ 9,985	$ 12,742
Compensation related deductions	2,915	3,749
Tax credits	2,409	3,502
Restructuring related liabilities	294	64
Inventory	4,415	4,495
Depreciation	503	683
Amortization	3,205
Warranty	1,127	876
Other	1,281	2,206
Total deferred tax assets	26,134	28,317
Valuation allowance for deferred tax assets	(12,537)	(14,495)
Net deferred tax assets	13,597	13,822
Deferred tax liabilities:
Equity investment	(1,733)	(1,594)
Depreciation		(341)
Amortization	(2,791)	(36)
Unrealized currency gain/loss	(1,292)	(2,595)
Other	(345)	(525)
Total deferred tax liabilities	(6,161)	(5,091)
Net deferred income tax assets (liabilities)	$ 7,436	$ 8,731