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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	$ (98,849)	$ (53,845)	$ (55,545)
Other comprehensive income (loss):
Change in fair value of investments	(170)	244	8
Adjustment for net losses realized and included in net loss	(21)	0	0
Total change in unrealized gains (losses) on investments	(191)	244	8
Change in unrealized gains on cash flow hedges	432	0	0
Total other comprehensive income	241	244	8
Comprehensive loss	$ (98,608)	$ (53,601)	$ (55,537)

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