Condensed Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balance (in shares) at Dec. 31, 2019	21,026,184
Balance at Dec. 31, 2019	$ 57	$ 407,986	$ (228,017)	$ 276	$ 180,302
Exercise of options into ordinary shares (in shares)	345,248
Exercise of options into ordinary shares	$ 1	690			691
Share-based compensation		21,499			21,499
Other comprehensive income (loss)				216	216
Net loss			(97,958)		(97,958)
Issuance of ordinary shares in public offering, net of issuance expense (in shares)	700,000
Issuance of ordinary shares in public offering, net of issuance expense	$ 2	15,775			15,777
Balance (in shares) at Sep. 30, 2020	22,071,432
Balance at Sep. 30, 2020	$ 60	445,950	(325,975)	492	120,527
Balance (in shares) at Jun. 30, 2020	22,001,296
Balance at Jun. 30, 2020	$ 60	438,999	(297,159)	760	142,660
Exercise of options into ordinary shares (in shares)	70,136
Exercise of options into ordinary shares	$ 0	188			188
Share-based compensation		6,763			6,763
Other comprehensive income (loss)				(268)	(268)
Net loss			(28,816)		(28,816)
Balance (in shares) at Sep. 30, 2020	22,071,432
Balance at Sep. 30, 2020	$ 60	445,950	(325,975)	492	120,527
Balance (in shares) at Dec. 31, 2020	22,167,791
Balance at Dec. 31, 2020	$ 60	452,525	(356,501)	271	96,355
Exercise of options into ordinary shares (in shares)	237,054
Exercise of options into ordinary shares	$ 1	60			61
Share-based compensation		17,756			17,756
Other comprehensive income (loss)				(267)	(267)
Net loss			(82,368)		(82,368)
Balance (in shares) at Sep. 30, 2021	22,404,845
Balance at Sep. 30, 2021	$ 61	470,341	(438,869)	4	31,537
Balance (in shares) at Jun. 30, 2021	22,354,533
Balance at Jun. 30, 2021	$ 61	464,823	(408,658)	45	56,271
Exercise of options into ordinary shares (in shares)	50,312
Exercise of options into ordinary shares	$ 0	3			3
Share-based compensation		5,515			5,515
Other comprehensive income (loss)				(41)	(41)
Net loss			(30,211)		(30,211)
Balance (in shares) at Sep. 30, 2021	22,404,845
Balance at Sep. 30, 2021	$ 61	$ 470,341	$ (438,869)	$ 4	$ 31,537