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Statements of Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Income Statement [Abstract]
Net loss	$ (27,531)	$ (37,037)
Unrealized (loss) gain on available-for-sale securities, net of tax	(7)	3
Comprehensive loss	$ (27,538)	$ (37,034)

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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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