Statements of Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Net Income (Loss)	$ (172,797)	$ (162,956)	$ (131,935)
Other comprehensive income (loss):
Unrealized gain (loss) on available-for-sale securities	632	(380)	(185)
Comprehensive loss	$ (172,165)	$ (163,336)	$ (132,120)