Income Taxes (Details 2) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred tax assets attributable to:
Net operating loss carryforwards	$ 31,572	$ 27,645
Tax credit carryforwards	7,622	7,622
Reserves	4,259	4,864
Inventory	4,260	5,090
Deferred financing costs		2,064
Fixed assets		263
Deferred revenue	4,417	3,853
Intangibles	5,594	5,434
Other	2,295	1,895
Total gross deferred tax assets	60,019	58,730
Valuation allowance	(57,577)	(54,945)
Net deferred tax assets	2,442	3,785
Deferred tax liabilities attributable to:
Intangibles	(2,408)	(3,798)
Fixed assets	$ (34)
Net deferred tax liability		$ (13)