Unaudited Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Operating expenses:
Research and development	$ 11,368	$ 7,395	$ 22,225	$ 13,756
General and administrative	3,992	1,793	7,688	3,394
Total operating expenses	15,360	9,188	29,913	17,150
Loss from operations	(15,360)	(9,188)	(29,913)	(17,150)
Other income (expense):
Interest income	27	134	63	363
Interest expense	(247)	(254)	(491)	(507)
Other expense	(5)	(14)	(12)	(140)
Total other income (expense)	(225)	(134)	(440)	(284)
Net loss	(15,585)	(9,322)	(30,353)	(17,434)
Other comprehensive loss:
Unrealized gain on available-for-sale securities, net	8	106	6	38
Comprehensive loss	$ (15,577)	$ (9,216)	$ (30,347)	$ (17,396)
Net loss per share, basic and diluted	$ (0.59)	$ (3.64)	$ (1.16)	$ (6.87)
Weighted average shares of common stock outstanding, basic and diluted	26,369,636	2,563,043	26,189,664	2,536,817