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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 Comprehensive Income [Abstract]
Net loss	$ (747,064)	$ (514,021)	$ (384,734)
Other comprehensive income (loss):
Unrealized gain (loss) on available-for-sale debt securities, net of tax of $0, $1,148 and $0, for the years ended December 31, 2020, 2019 and 2018, respectively	2,501	3,447	(132)
Less: amounts recognized for net realized gain included in net loss	(1,301)	(323)	(31)
Total other comprehensive income (loss)	1,200	3,124	(163)
Comprehensive loss	$ (745,864)	$ (510,897)	$ (384,897)

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