Condensed Consolidated Statements of Convertible Preferred Shares and Shareholders’ Equity (Deficit) - USD ($) $ in Thousands	Series A Convertible Preferred Shares	Series B1 Convertible Preferred Shares	Series B2 Convertible Preferred Shares	Ordinary Shares	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit	Total
Beginning balance at Dec. 31, 2018	$ 41,820	$ 54,621	$ 25,756
Beginning balance (in shares) at Dec. 31, 2018	2,800,001	3,947,198	1,323,248
Increase (decrease) in convertible preferred shares
Issuance of convertible preferred shares			$ 1,583
Issuance of convertible preferred shares (in shares)			80,385
Ending balance at Mar. 31, 2019	$ 41,820	$ 54,621	$ 27,339
Ending balance (in shares) at Mar. 31, 2019	2,800,001	3,947,198	1,403,633
Beginning balance at Dec. 31, 2018				$ 10	$ 1,857	$ (1,751)	$ (69,942)	$ (69,826)
Beginning balance (in shares) at Dec. 31, 2018				814,728
Increase (decrease) in shareholders' equity (deficit)
Issuance of restricted share awards				$ 1	103			104
Issuance of restricted share awards (in shares)				27,304
Issuance of ordinary shares upon exercise of share options (in shares)				3
Share based compensation expense					172			172
Foreign currency translation adjustment						1,080		1,080
Net loss							(6,503)	(6,503)
Ending balance at Mar. 31, 2019				$ 11	2,132	(671)	(76,445)	(74,973)
Ending balance (in shares) at Mar. 31, 2019				842,035
Beginning balance at Dec. 31, 2019				$ 227	195,056	(1,535)	(100,550)	$ 93,198
Beginning balance (in shares) at Dec. 31, 2019				17,993,701				17,993,701
Increase (decrease) in shareholders' equity (deficit)
Issuance of ordinary shares upon exercise of share options					2			$ 2
Issuance of ordinary shares upon exercise of share options (in shares)				1,071
Issuance of ordinary shares upon exercise of warrants (in shares)				21,435
Share based compensation expense					2,121			2,121
Foreign currency translation adjustment						(2,184)		(2,184)
Net loss							(11,324)	(11,324)
Ending balance at Mar. 31, 2020				$ 227	$ 197,179	$ (3,719)	$ (111,874)	$ 81,813
Ending balance (in shares) at Mar. 31, 2020				18,016,207				18,016,207