Condensed Statements of Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net Loss	$ (21,220)	$ (27,142)
Other comprehensive loss:
Unrealized loss on investments	(47)
Comprehensive loss	$ (21,267)	$ (27,142)

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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+ Details