Condensed Consolidated Statements of Shareholders’ Equity - USD ($) $ in Thousands	Ordinary Shares	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit	Total
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
Increase (decrease) in shareholders' equity (deficit)
Issuance of ADSs upon exercise of share options		2			2
Issuance of ADSs 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
Beginning balance at Dec. 31, 2020	$ 266	249,947	(3,193)	(151,560)	$ 95,460
Beginning balance (in shares) at Dec. 31, 2020	21,094,557				21,094,557
Increase (decrease) in shareholders' equity (deficit)
Issuance of ADSs upon exercise of share options	$ 1	283			$ 284
Issuance of ADSs upon exercise of share options (in shares)	63,545
Issuance of ADSs, net of commissions and offering expenses	$ 33	58,742			58,775
Issuance of ADSs, net of commissions and offering expenses (in shares)	2,358,485
Share based compensation expense		3,821			3,821
Foreign currency translation adjustment			(58)		(58)
Net loss				(16,191)	(16,191)
Ending balance at Mar. 31, 2021	$ 300	$ 312,793	$ (3,251)	$ (167,751)	$ 142,091
Ending balance (in shares) at Mar. 31, 2021	23,516,587				23,516,587