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Statements of Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement Of Financial Position [Abstract]
Net loss	$ (146,227)	$ (68,606)	$ (46,447)
Change in unrealized gain (loss) on investments	222	778	59
Comprehensive loss	$ (146,005)	$ (67,828)	$ (46,388)

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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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