Income Taxes (Details 3) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred tax assets:
Intangible assets other than goodwill	$ 5,208	$ 3,788
Pension and other retiree obligations	547	425
Inventory	46	2,070
Other accruals and reserves	2,546	1,132
Loss and credit carryforwards	27,682	12,991
Other	952	816
Valuation allowance	(27,732)	(9,111)
Deferred tax assets	9,249	12,111
Deferred tax liabilities:
Intangible assets other than goodwill	0	0
Property, plant and equipment	(790)	(118)
Deferred tax liabilities	(790)	(118)
Net deferred tax assets / (liabilities)	$ 8,459	$ 11,993