Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Condensed Consolidated Statements of Operations and Comprehensive Loss
Collaboration revenues	$ 4,333	$ 3,842	$ 7,926	$ 6,542
Operating expenses:
Research and development	10,513	7,363	31,924	23,091
General and administrative	8,114	7,154	23,596	18,351
Total operating expenses	18,627	14,517	55,520	41,442
Loss from operations	(14,294)	(10,675)	(47,594)	(34,900)
Other income (expense):
Interest income	24	72	61	655
Interest expense	(823)		(2,164)
Total other income (expense), net	(799)	72	(2,103)	655
Net loss before income tax provision	(15,093)	(10,603)	(49,697)	(34,245)
Benefit from income taxes	(415)	(465)	(915)	(668)
Net loss	$ (14,678)	$ (10,138)	$ (48,782)	$ (33,577)
Net loss per share, basic	$ (0.59)	$ (0.52)	$ (2.06)	$ (1.81)
Net loss per share, diluted	$ (0.59)	$ (0.52)	$ (2.06)	$ (1.81)
Weighted average ordinary shares outstanding, basic	25,039,990	19,426,833	23,719,124	18,504,013
Weighted average ordinary shares outstanding, diluted	25,039,990	19,426,833	23,719,124	18,504,013
Comprehensives Loss:
Net loss	$ (14,678)	$ (10,138)	$ (48,782)	$ (33,577)
Other comprehensive income (loss):
Foreign currency translation adjustment	313	743		(1,442)
Total comprehensive loss	$ (14,365)	$ (9,395)	$ (48,782)	$ (35,019)