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Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (86,420)	$ (120,875)	$ (58,068)
Other comprehensive income (loss):
Foreign currency translation adjustments	771	(2,022)	532
Available-for-sale investments:
Unrealized gain (loss) on investments, net of tax effect	(7)	1,259	140
Reclassification from accumulated other comprehensive loss	0	(72)	19
Net change in unrealized gain on available-for-sale investments	(7)	1,187	159
Other comprehensive income (loss), net of taxes	764	(835)	691
Comprehensive loss	$ (85,656)	$ (121,710)	$ (57,377)

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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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