Consolidated Statements of Net Loss and Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
OPERATING EXPENSES
Research and development	$ 21,005	$ 19,660	$ 69,686	$ 46,665
General and administrative	11,636	4,699	30,155	12,581
Total operating expenses	32,641	24,359	99,841	59,246
Loss from operations	(32,641)	(24,359)	(99,841)	(59,246)
OTHER INCOME, NET
Interest and other income / (expenses), net	(191)	437	437	1,354
NET LOSS	(32,832)	(23,922)	(99,404)	(57,892)
Other comprehensive income
Foreign currency translation	(12)	134	(78)	124
COMPREHENSIVE LOSS	$ (32,844)	$ (23,788)	$ (99,482)	$ (57,768)
Net loss per share attributable to common stockholders, basic and diluted	$ (0.82)	$ (0.70)	$ (2.49)	$ (1.69)
Weighted average common shares outstanding, basic and diluted	40,187,173	34,371,927	39,971,766	34,253,739