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Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (42,556)	$ (24,459)	$ (107,373)	$ (86,981)
Other comprehensive income (loss):
Foreign currency translation adjustments	72	(578)	503	(1,827)
Available-for-sale investments:
Unrealized gain on investments, net of tax effect	(31)	403	(28)	1,250
Reclassification from accumulated other comprehensive loss	0	(47)	0	(72)
Net change in unrealized gain on available-for-sale investments	(31)	356	(28)	1,178
Other comprehensive income (loss), net of taxes	41	(222)	475	(649)
Comprehensive loss	$ (42,515)	$ (24,681)	$ (106,898)	$ (87,630)

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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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