Components of Company Net Deferred Tax Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Net operating loss carryforwards	$ 48,374	$ 49,787
Tax credit carryforwards	384,381	352,535
Accrued expenses, reserves, and prepaids	54,565	77,904
Intangible assets	17,556	26,751
Stock-based compensation	31,371	47,713
Inventory	13,206	15,581
Impairment	2,609	5,017
Other	2,358	1,519
Valuation allowance	(111,001)	(73,037)
Total deferred tax assets	443,419	503,770
Joint venture basis difference	(1,229)	(1,714)
Acquired intangibles	(3,332)	(8,773)
Convertible notes discount	(10,100)	(24,394)
Property, plant and equipment	(29,663)	(22,103)
Total deferred tax liabilities	(44,324)	(56,984)
Net deferred tax assets	$ 399,095	$ 446,786