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Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (85,779)	$ (59,504)	$ (14,943)
Other comprehensive income (loss):
Foreign currency translation adjustments	1,662	2,082	(665)
Available-for-sale investments:
Unrealized gain (loss) on investments, net of tax effect	30	(965)	(1,936)
Reclassification from accumulated other comprehensive loss	(194)	(758)	(740)
Net change in unrealized loss on available-for-sale investments	(164)	(1,723)	(2,676)
Other comprehensive income (loss), net of taxes	1,498	359	(3,341)
Comprehensive loss	$ (84,281)	$ (59,145)	$ (18,284)

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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