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Condensed Statements of Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Statement [Abstract]
Net loss	$ (11,449)	$ (7,794)
Unrealized gain (loss) on available-for-sale securities, net of tax	4	(3)
Comprehensive loss	$ (11,445)	$ (7,797)

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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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