Condensed Consolidated Statements of Shareholders’ Equity (Deficit) and Convertible Preferred Shares - USD ($) $ in Thousands	Common shares	Additional paid-in capital	Cumulative translation adjustment	Accumulated deficit	Class A1 preferred shares	Class A2 preferred shares	Class B preferred shares	Class C preferred shares	Class D1 preferred shares	Class D2 preferred shares	Total
Balance at the beginning of period at Dec. 31, 2017	$ 1,228	$ 2,372	$ (1,634)	$ (35,085)							$ 25,985
Balance at the beginning of period (in shares) at Dec. 31, 2017	239,990
Temporary equity, balance at the beginning of period at Dec. 31, 2017					$ 2,027	$ 12,643	$ 17,198	$ 27,236
Temporary equity, balance at the beginning of period (in shares) at Dec. 31, 2017					372,211	2,443,914	2,830,907	3,786,878
Increase (Decrease) in Stockholders' Equity and Temporary Equity [Roll Forward]
Net loss and comprehensive loss				(23,185)							(23,185)
Issuance of preferred shares, net of share issuance costs									$ 64,719	$ 14,935
Issuance of preferred shares, net of share issuance costs (in shares)									6,893,236	1,223,656
Exercise of stock options (note 7)	$ 811	(350)									461
Exercise of stock options (note 7) (in shares)	356,797
Share-based compensation (note 7)		633									633
Balance at the end of period at Dec. 31, 2018	$ 2,039	2,655	(1,634)	(58,270)							$ 83,548
Balance at the end of period (in shares) at Dec. 31, 2018	596,787										596,787
Temporary equity, balance at the end of period at Dec. 31, 2018					$ 2,027	$ 12,643	$ 17,198	$ 27,236	$ 64,719	$ 14,935	$ 138,758
Temporary equity, balance at the end of period (in shares) at Dec. 31, 2018					372,211	2,443,914	2,830,907	3,786,878	6,893,236	1,223,656
Increase (Decrease) in Stockholders' Equity and Temporary Equity [Roll Forward]
Net loss and comprehensive loss				(55,229)							(55,229)
Exercise of stock options (note 7)	$ 85	(41)									$ 44
Exercise of stock options (note 7) (in shares)	33,159										33,162
Share-based compensation (note 7)		1,191									$ 1,191
Initial public offering (note 7)	$ 85,363										85,363
Initial public offering (note 7) (in shares)	6,325,000
Preferred share conversion (note 7)	$ 138,758				$ (2,027)	$ (12,643)	$ (17,198)	$ (27,236)	$ (64,719)	$ (14,935)
Preferred share conversion (note 7) (in shares)	17,550,802				(372,211)	(2,443,914)	(2,830,907)	(3,786,878)	(6,893,236)	(1,223,656)
Balance at the end of period at Dec. 31, 2019	$ 226,245	$ 3,805	$ (1,634)	$ (113,499)							$ 114,917
Balance at the end of period (in shares) at Dec. 31, 2019	24,505,748										24,505,748