Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
REVENUE
Collaboration and service revenue	$ 2,816	$ 461
OPERATING EXPENSES
Research and development	5,641	6,419
General and administrative	3,624	4,059
Total operating expenses	9,265	10,478
LOSS FROM OPERATIONS	(6,449)	(10,017)
OTHER INCOME (EXPENSE):
Interest income	5	6
Interest expense	(218)	(271)
Total other expense, net	(213)	(265)
Net loss	$ (6,662)	$ (10,282)
Net loss per share—basic and diluted	$ (0.20)	$ (0.32)
Weighted-average common stock outstanding—basic and diluted	32,961,180	31,933,794