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Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (76,970)	$ (86,420)	$ (120,875)
Other comprehensive income (loss):
Foreign currency translation adjustments	331	771	(2,022)
Available-for-sale investments:
Unrealized gain (loss) on investments, net of tax effect	592	(7)	1,259
Reclassification from accumulated other comprehensive loss	0	0	(72)
Net change in unrealized gain on available-for-sale investments	592	(7)	1,187
Other comprehensive income (loss), net of taxes	923	764	(835)
Comprehensive loss	$ (76,047)	$ (85,656)	$ (121,710)

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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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