Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Common stock/Ordinary shares	Additional paid in capital	Accumulated other comprehensive income	Accumulated deficit	Total
Stockholders' equity, beginning balance at Dec. 31, 2020	$ 211	$ 579,123	$ 27	$ (546,226)	$ 33,135
Stockholders' equity, beginning balance (in shares) at Dec. 31, 2020	21,079
Consolidated Statements of Changes in Stockholders' Equity
Issuance of ordinary shares	$ 143	37,097			37,240
Issuance of ordinary shares (in shares)	14,294
Shares issued in connection with the vesting of restricted share units		1			1
Shares issued in connection with the vesting of restricted share units (in shares)	40
Equity transaction costs		(2,325)			(2,325)
Stock-based compensation expense		921			921
Net loss				(13,981)	(13,981)
Stockholders' equity, ending balance at Mar. 31, 2021	$ 354	614,817	27	(560,207)	54,991
Stockholders' equity, ending balance (in shares) at Mar. 31, 2021	35,413
Stockholders' equity, beginning balance at Dec. 31, 2020	$ 211	579,123	27	(546,226)	33,135
Stockholders' equity, beginning balance (in shares) at Dec. 31, 2020	21,079
Consolidated Statements of Changes in Stockholders' Equity
Net loss					(25,735)
Stockholders' equity, ending balance at Jun. 30, 2021	$ 497	640,638	27	(571,961)	69,201
Stockholders' equity, ending balance (in shares) at Jun. 30, 2021	49,738
Stockholders' equity, beginning balance at Mar. 31, 2021	$ 354	614,817	27	(560,207)	54,991
Stockholders' equity, beginning balance (in shares) at Mar. 31, 2021	35,413
Consolidated Statements of Changes in Stockholders' Equity
Issuance of ordinary shares	$ 142	25,997			26,139
Issuance of ordinary shares (in shares)	14,313
Shares issued in connection with the vesting of restricted share units	$ 1	(1)
Shares issued in connection with the vesting of restricted share units (in shares)	12
Equity transaction costs		(992)			(992)
Stock-based compensation expense		817			817
Net loss				(11,754)	(11,754)
Stockholders' equity, ending balance at Jun. 30, 2021	$ 497	640,638	27	(571,961)	69,201
Stockholders' equity, ending balance (in shares) at Jun. 30, 2021	49,738
Stockholders' equity, beginning balance at Dec. 31, 2021	$ 567	648,432	27	(595,676)	53,350
Stockholders' equity, beginning balance (in shares) at Dec. 31, 2021	56,715
Consolidated Statements of Changes in Stockholders' Equity
Issuance of ordinary shares	$ 49	2,172			2,221
Issuance of ordinary shares (in shares)	4,938
Shares issued in connection with the vesting of restricted share units	$ 1	(1)
Shares issued in connection with the vesting of restricted share units (in shares)	72
Equity transaction costs		(127)			(127)
Stock-based compensation expense		1,000			1,000
Net loss				(11,819)	(11,819)
Stockholders' equity, ending balance at Mar. 31, 2022	$ 617	651,476	27	(607,495)	44,625
Stockholders' equity, ending balance (in shares) at Mar. 31, 2022	61,725
Stockholders' equity, beginning balance at Dec. 31, 2021	$ 567	648,432	27	(595,676)	53,350
Stockholders' equity, beginning balance (in shares) at Dec. 31, 2021	56,715
Consolidated Statements of Changes in Stockholders' Equity
Net loss					(22,893)
Stockholders' equity, ending balance at Jun. 30, 2022	$ 646	652,501	27	(618,569)	34,605
Stockholders' equity, ending balance (in shares) at Jun. 30, 2022	64,580
Stockholders' equity, beginning balance at Mar. 31, 2022	$ 617	651,476	27	(607,495)	44,625
Stockholders' equity, beginning balance (in shares) at Mar. 31, 2022	61,725
Consolidated Statements of Changes in Stockholders' Equity
Issuance of ordinary shares	$ 28	790			818
Issuance of ordinary shares (in shares)	2,843
Shares issued in connection with the vesting of restricted share units	$ 1				1
Shares issued in connection with the vesting of restricted share units (in shares)	12
Equity transaction costs		(82)			(82)
Stock-based compensation expense		317			317
Net loss				(11,074)	(11,074)
Stockholders' equity, ending balance at Jun. 30, 2022	$ 646	$ 652,501	$ 27	$ (618,569)	$ 34,605
Stockholders' equity, ending balance (in shares) at Jun. 30, 2022	64,580