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CONDENSED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (15,824)	$ (14,239)	$ (32,179)	$ (24,298)
Net unrealized gain on marketable securities	313	182	57	464
Comprehensive loss	$ (15,511)	$ (14,057)	$ (32,122)	$ (23,834)

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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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