Statements of Loss and Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Statements of Loss and Comprehensive Loss
Net loss	$ (19,186)	$ (27,877)	$ (40,196)	$ (52,753)
Other comprehensive income (loss):
Unrealized gain (loss) on available-for-sale debt securities	30	(191)	268	(559)
Comprehensive loss	$ (19,156)	$ (28,068)	$ (39,928)	$ (53,312)