CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Operating expenses:
Research and development	$ 4,923	$ 9,106	$ 10,023	$ 17,336
General and administrative	2,090	2,184	4,403	5,437
Total operating expenses	7,013	11,290	14,426	22,773
Loss from operations	(7,013)	(11,290)	(14,426)	(22,773)
Interest income and other expense, net	100	1	111	4
Sublease income - related party	146		292
Loss from equity method investment	(1,596)	(463)	(2,637)	(563)
Net loss	$ (8,363)	$ (11,752)	$ (16,660)	$ (23,332)
Net loss per share, basic	$ (0.18)	$ (0.28)	$ (0.36)	$ (0.61)
Net loss per share, diluted	$ (0.18)	$ (0.28)	$ (0.36)	$ (0.61)
Shares used to compute net loss per share, basic	46,553,511	42,247,094	46,553,511	38,402,464
Shares used to compute net loss per share, diluted	46,553,511	42,247,094	46,553,511	38,402,464
Other comprehensive loss:
Unrealized gain (loss) on marketable securities	$ (54)	$ (4)	$ (82)	$ (2)
Cumulative foreign currency translation adjustment	(1,594)	1,385	(1,448)	1,385
Comprehensive loss	$ (10,011)	$ (10,371)	$ (18,190)	$ (21,949)