Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Operating expenses:
Research and development	$ 15,362	$ 26,623	$ 68,396	$ 84,705
Acquired inprocess research and development	1,500	5,500	3,000	7,000
General and administrative	10,664	14,978	38,754	42,864
Loss from operations	(27,526)	(47,101)	(110,150)	(134,569)
Interest income, net	825	186	1,096	337
Net loss	$ (26,701)	$ (46,915)	$ (109,054)	$ (134,232)
Per share information:
Net loss per share of common stock, basic	$ (0.49)	$ (0.87)	$ (2.01)	$ (2.53)
Net loss per share of common stock, diluted	$ (0.49)	$ (0.87)	$ (2.01)	$ (2.53)
Weighted average common shares outstanding, basic	54,473,945	53,995,560	54,379,397	53,080,645
Weighted average common shares outstanding, diluted	54,473,945	53,995,560	54,379,397	53,080,645
Comprehensive loss:
Net loss	$ (26,701)	$ (46,915)	$ (109,054)	$ (134,232)
Unrealized gain (loss) on marketable securities	110	14	(1,055)	45
Comprehensive loss	$ (26,591)	$ (46,901)	$ (110,109)	$ (134,187)