Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Deferred tax assets
Allowance for doubtful accounts	$ 1,676	$ 1,056
Inventory	447	967
Equity securities and investments in affiliates	31,729	10,413
Accrued liabilities and long-term debt	4,168	4,585
Stock-based compensation	8,460	7,223
Deferred revenue	68,056	31,637
Research and development tax credits	10,396	9,113
Net operating and capital loss carryforwards	144,502	135,633
Total deferred tax assets	269,434	200,627
Less: Valuation allowance	256,165	190,174	$ 161,660	$ 131,985
Net deferred tax assets	13,269	10,453
Deferred tax liabilities
Property, plant and equipment	406	160
Intangible assets	29,870	32,095
Total deferred tax liabilities	30,276	32,255
Net deferred tax liabilities	$ (17,007)	$ (21,802)