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Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (281,584)	$ (235,259)	$ (245,192)
Other comprehensive income (loss):
Unrealized (loss) gain on investment securities	(253)	667	24
Foreign currency translation adjustments	(8)	2	3
Comprehensive loss	$ (281,845)	$ (234,590)	$ (245,165)

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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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