Unaudited Condensed Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Ordinary shares	Additional Paid-in Capital [Member]	Accumulated deficit	Accumulated other comprehensive income (loss)	Total
Stockholders' equity, beginning balance at Dec. 31, 2020	$ 625	$ 548,070	$ (452,610)	$ (2,229)	$ 93,856
Shares, Outstanding, Beginning Balance at Dec. 31, 2020	62,545,832
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share compensation, value	$ 2	1,309			1,311
Share compensation, shares	173,299
Net loss			(9,612)		(9,612)
Payments for taxes related to the net share settlement of equity awards		(358)			(358)
Stockholders' equity, ending balance at Mar. 31, 2021	$ 627	549,021	(462,222)	(2,229)	85,197
Shares, Outstanding, Ending Balance at Mar. 31, 2021	62,719,131
Stockholders' equity, beginning balance at Dec. 31, 2020	$ 625	548,070	(452,610)	(2,229)	93,856
Shares, Outstanding, Beginning Balance at Dec. 31, 2020	62,545,832
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss					(45,198)
Stockholders' equity, ending balance at Sep. 30, 2021	$ 631	554,156	(497,808)	(2,229)	54,750
Shares, Outstanding, Ending Balance at Sep. 30, 2021	63,127,288
Stockholders' equity, beginning balance at Mar. 31, 2021	$ 627	549,021	(462,222)	(2,229)	85,197
Shares, Outstanding, Beginning Balance at Mar. 31, 2021	62,719,131
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share compensation, value	$ 1	1,232			1,233
Share compensation, shares	128,931
Net loss			(17,727)		(17,727)
Payments for taxes related to the net share settlement of equity awards		(249)			(249)
Stockholders' equity, ending balance at Jun. 30, 2021	$ 628	550,004	(479,949)	(2,229)	68,454
Shares, Outstanding, Ending Balance at Jun. 30, 2021	62,848,062
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share compensation, value	$ 2	4,277			4,279
Share compensation, shares	133,064
Net loss			(17,859)		(17,859)
Payments for taxes related to the net share settlement of equity awards		(160)			(160)
Proceeds from issuance of ordinary shares, net of offering costs	$ 1	35			36
Proceeds from issuance of ordinary shares, net of offering costs (Shares)	146,162
Stockholders' equity, ending balance at Sep. 30, 2021	$ 631	554,156	(497,808)	(2,229)	54,750
Shares, Outstanding, Ending Balance at Sep. 30, 2021	63,127,288
Stockholders' equity, beginning balance at Dec. 31, 2021	$ 833	591,730	(517,530)	1,700	76,733
Shares, Outstanding, Beginning Balance at Dec. 31, 2021	83,297,567
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share compensation, value	$ 2	1,326			1,328
Share compensation, shares	217,844
Net loss			(6,821)		(6,821)
Payments for taxes related to the net share settlement of equity awards		(57)			(57)
Change in credit risk associated with fair value of debt				(1,700)	(1,700)
Stockholders' equity, ending balance at Mar. 31, 2022	$ 835	592,999	(524,351)		69,483
Shares, Outstanding, Ending Balance at Mar. 31, 2022	83,515,411
Stockholders' equity, beginning balance at Dec. 31, 2021	$ 833	591,730	(517,530)	$ 1,700	76,733
Shares, Outstanding, Beginning Balance at Dec. 31, 2021	83,297,567
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss					(33,373)
Stockholders' equity, ending balance at Sep. 30, 2022	$ 992	618,457	(550,903)		68,546
Shares, Outstanding, Ending Balance at Sep. 30, 2022	99,151,706
Stockholders' equity, beginning balance at Mar. 31, 2022	$ 835	592,999	(524,351)		69,483
Shares, Outstanding, Beginning Balance at Mar. 31, 2022	83,515,411
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share compensation, value	$ 1	1,207			1,208
Share compensation, shares	102,156
Net loss			(12,106)		(12,106)
Payments for taxes related to the net share settlement of equity awards		(74)			(74)
Stockholders' equity, ending balance at Jun. 30, 2022	$ 836	594,132	(536,457)		58,511
Shares, Outstanding, Ending Balance at Jun. 30, 2022	83,617,567
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share compensation, value	$ 1	830			831
Share compensation, shares	82,527
Net loss			(14,446)		(14,446)
Payments for taxes related to the net share settlement of equity awards		(5)			(5)
Proceeds from issuance of ordinary shares, net of offering costs	$ 155	23,500			23,655
Proceeds from issuance of ordinary shares, net of offering costs (Shares)	15,451,612
Stockholders' equity, ending balance at Sep. 30, 2022	$ 992	$ 618,457	$ (550,903)		$ 68,546
Shares, Outstanding, Ending Balance at Sep. 30, 2022	99,151,706