Condensed Consolidated Statements of Shareholders' Equity (unaudited) - USD ($) $ in Thousands	Total	Ordinary Shares	Additional Paid-In Capital	Accumulated Deficit	Other Comprehensive Income
Balance at Dec. 31, 2019	$ 180,302	$ 57	$ 407,986	$ (228,017)	$ 276
Balance,Share at Dec. 31, 2019		21,026,184
Exercise of options into ordinary shares	293	$ 1	292
Exercise of options into ordinary shares, shares		186,756
Share-based compensation	7,617		7,617
Other comprehensive income (loss)	35				35
Net loss	(37,793)			(37,793)
Balance at Mar. 31, 2020	150,454	$ 58	415,895	(265,810)	311
Balance,Share at Mar. 31, 2020		21,212,940
Balance at Dec. 31, 2020	96,355	$ 60	452,525	(356,501)	271
Balance,Share at Dec. 31, 2020		22,167,791
Exercise of options into ordinary shares	4	$ 1	3
Exercise of options into ordinary shares, shares		112,603
Share-based compensation	6,195		6,195
Other comprehensive income (loss)	(128)				(128)
Net loss	(25,935)			(25,935)
Balance at Mar. 31, 2021	$ 76,491	$ 61	$ 458,723	$ (382,436)	$ 143
Balance,Share at Mar. 31, 2021		22,280,394