Income Taxes - Deferred Tax Assets And Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Significant components of the Company's deferred tax assets and liabilities
Valuation allowance	$ (74,100)	$ (49,500)
Net deferred tax assets	0
Section 382 recognized built in loss	5,400
Deferred tax assets included in other noncurrent assets		1,400
Deferred tax liabilities included in other current liabilities		1,400
U.S.
Significant components of the Company's deferred tax assets and liabilities
Deferred revenue	7,017	4,492
Other reserves and accruals	6,411	1,492
Tax credit carryforwards	798
Property, plant and equipment	1,803	1,624
Amortization of stock-based compensation	13,145	10,623
Capitalized research & development expenditures	13,431	12,816
Net operating loss carryforwards	27,202	18,857
Total deferred tax asset	69,807	49,904
Valuation allowance	(62,584)	(40,002)
Net deferred tax assets	7,223	9,902
Intangible assets	(220)	(335)
Non-employee stock based compensation	(1,556)	(1,556)
Section 382 recognized built in loss	(5,447)	(8,011)
Net deferred tax liability	(7,223)	(9,902)
Foreign
Significant components of the Company's deferred tax assets and liabilities
Intangible assets	1,469	1,269
Tax credit carryforwards	65	78
Property, plant and equipment	389	464
Capitalized research & development expenditures	4,008	4,777
Net operating loss carryforwards	5,797	2,931
Total deferred tax asset	11,728	9,519
Valuation allowance	(11,520)	$ (9,519)
Net deferred tax assets	208
Property, plant and equipment	(208)
Net deferred tax liability	$ (208)