Income Taxes - Deferred Tax Assets And Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Significant components of the Company's deferred tax assets and liabilities
Valuation allowance	$ (101,400)	$ (74,100)
U.S.
Significant components of the Company's deferred tax assets and liabilities
Deferred revenue	8,713	7,017
Other reserves and accruals	1,703	6,411
Tax credit carryforwards	1,218	798
Property, plant and equipment	754	1,803
Amortization of stock-based compensation	17,167	13,145
Capitalized research & development expenditures	16,935	13,431
Net operating loss carryforwards	43,929	27,202
Total deferred tax asset	90,419	69,807
Valuation allowance	(85,731)	(62,584)
Net deferred tax assets	4,688	7,223
Intangible assets	(177)	(220)
Non-employee stock based compensation	(1,628)	(1,556)
Section 382 recognized built in loss	(2,883)	(5,447)
Net deferred tax liability	(4,688)	(7,223)
Foreign
Significant components of the Company's deferred tax assets and liabilities
Intangible assets	1,614	1,469
Tax credit carryforwards	1,216	65
Property, plant and equipment		389
Capitalized research & development expenditures	4,352	4,008
Net operating loss carryforwards	8,624	5,797
Total deferred tax asset	15,806	11,728
Valuation allowance	(15,646)	(11,520)
Net deferred tax assets	160	208
Property, plant and equipment	(160)	(208)
Net deferred tax liability	$ (160)	$ (208)