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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (14,139)	$ (17,967)	$ (45,476)	$ (54,321)
Other comprehensive (loss) income
Unrealized (losses) gains on available-for-sale investments, net of taxes	(218)	48	793	420
Comprehensive loss	$ (14,357)	$ (17,919)	$ (44,683)	$ (53,901)

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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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