Income Taxes Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred tax assets and liabilities [Abstract]
Accruals and prepaids	$ 4,606	$ 3,563
Intangible assets	146	619
Property and equipment	(1,396)	(770)
R&D and other tax credits	3,293	2,086
Stock compensation	7,063	4,163
Charitable contributions	0	1
Federal and state basis difference	145	114
Net operating loss	1,763	6,382
Net deferred tax assets	15,620	16,158
Valuation allowance	(782)	(16,158)
Deferred tax assets and liabilities, net of valuation allowance	$ 14,838	$ 0