Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Condensed Consolidated Statements of Operations and Comprehensive Loss
Collaboration revenues	$ 1,129	$ 6,384
Operating expenses:
Research and development	7,774	6,276
General and administrative	4,998	3,402
Total operating expenses	12,772	9,678
Loss from operations	(11,643)	(3,294)
Other income (expense):
Interest and other income	212	64
Other expense, net		(3,193)
Total other income (expense), net	212	(3,129)
Net loss before income tax provision	(11,431)	(6,423)
(Benefit from) provision for income taxes	(107)	80
Net loss	(11,324)	(6,503)
Net loss attributable to ordinary shareholders	$ (11,324)	$ (6,503)
Net loss per share attributable to ordinary shareholders, basic and diluted	$ (0.63)	$ (7.80)
Weighted average ordinary shares outstanding, basic and diluted	17,997,929	834,043
Comprehensives Loss:
Net loss	$ (11,324)	$ (6,503)
Other comprehensive income (loss):
Foreign currency translation adjustment	(2,184)	1,080
Total comprehensive loss	$ (13,508)	$ (5,423)