Income Taxes (Details 3) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred tax assets:
Tax credits	$ 1,602	$ 4,392
Property and equipment	497	893
Stock compensation	615	605
French deferred assets	279	345
Bad debt reserves and inventory	828	463
Operating loss carry forwards	7	36
Other	672	102
Total gross deferred tax assets	4,500	6,836
Less: valuation allowance	0	(2,024)
Total net deferred tax assets	4,500	4,812
Deferred tax liabilities:
Excess book basis in shares of GPI-SAS	1,603	1,503
French deferred liabilities	338	456
Intangible assets	379	111
Total deferred tax liabilities	2,320	2,070
Deferred tax assets, net	$ 2,180	$ 2,742