Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Income Statement [Abstract]
Collaboration revenue	$ 3,920	$ 286
Operating expenses:
Research and development	24,508	18,726
General and administrative	7,216	4,690
Total operating expenses	31,724	23,416
Loss from operations	(27,804)	(23,130)
Other income (expense):
Interest expense	0	(486)
Interest income and other income (expense), net	890	630
Total other income, net	890	144
Net loss	$ (26,914)	$ (22,986)
Net loss per share attributable to common stockholders—basic (in dollars per share)	$ (0.65)	$ (0.62)
Net loss per share attributable to common stockholders—diluted (in dollars per share)	$ (0.65)	$ (0.62)
Weighted average common shares outstanding—basic (in shares)	41,370,186	36,817,277
Weighted average common shares outstanding—diluted (in shares)	41,370,186	36,817,277
Comprehensive loss:
Net loss	$ (26,914)	$ (22,986)
Other comprehensive loss:
Unrealized gains (losses) on marketable securities	(1,184)	13
Total other comprehensive gain (loss)	(1,184)	13
Total comprehensive loss	$ (28,098)	$ (22,973)