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, 2020	$ 2,711	$ 1,016,018	$ 9,907	$ (784,731)	$ 243,905
Beginning balance (in shares) at Dec. 31, 2020	44,777,799
Increase (decrease) in shareholders' equity
Income / Loss for the period				321,381	321,381
Other comprehensive loss			(27,790)		(27,790)
Issuance of ordinary shares	$ 55	29,510			29,565
Issuance of ordinary shares (in shares)	921,730
Income tax benefit of past share issuance cost		2,977			2,977
Exercise of share options	$ 10	1,814			1,824
Exercise of share options (in shares)	156,787
Restricted and performance share units distributed during the period	$ 21	(21)
Restricted and performance share units distributed during the period (in shares)	346,736
Share-based compensation expense		18,747			18,747
Issuance of ordinary shares relating to employee stock purchase plan		146			146
Issuance of ordinary shares relating to employee stock purchase plan (in shares)	4,724
Ending balance at Sep. 30, 2021	$ 2,797	1,069,191	(17,883)	(463,350)	590,755
Ending balance (in shares) at Sep. 30, 2021	46,207,776
Beginning balance at Jun. 30, 2021	$ 2,788	1,062,234	(4,595)	(426,819)	633,608
Beginning balance (in shares) at Jun. 30, 2021	46,050,250
Increase (decrease) in shareholders' equity
Income / Loss for the period				(36,531)	(36,531)
Other comprehensive loss			(13,288)		(13,288)
Exercise of share options	$ 5	909			914
Exercise of share options (in shares)	84,811
Restricted and performance share units distributed during the period	$ 4	(4)
Restricted and performance share units distributed during the period (in shares)	69,165
Share-based compensation expense		5,955			5,955
Issuance of ordinary shares relating to employee stock purchase plan		97			97
Issuance of ordinary shares relating to employee stock purchase plan (in shares)	3,550
Ending balance at Sep. 30, 2021	$ 2,797	1,069,191	(17,883)	(463,350)	590,755
Ending balance (in shares) at Sep. 30, 2021	46,207,776
Beginning balance at Dec. 31, 2021	$ 2,802	1,076,972	(28,856)	(455,142)	$ 595,776
Beginning balance (in shares) at Dec. 31, 2021	46,298,635				46,298,635
Increase (decrease) in shareholders' equity
Income / Loss for the period				(133,596)	$ (133,596)
Other comprehensive loss			(64,144)		(64,144)
Exercise of share options	$ 6	707			713
Exercise of share options (in shares)	119,884
Restricted and performance share units distributed during the period	$ 21	(21)
Restricted and performance share units distributed during the period (in shares)	387,285
Share-based compensation expense		22,290			22,290
Issuance of ordinary shares relating to employee stock purchase plan	$ 1	130			131
Issuance of ordinary shares relating to employee stock purchase plan (in shares)	9,305
Ending balance at Sep. 30, 2022	$ 2,830	1,100,078	(93,000)	(588,738)	$ 421,170
Ending balance (in shares) at Sep. 30, 2022	46,815,109				46,815,109
Beginning balance at Jun. 30, 2022	$ 2,823	1,092,176	(67,630)	(540,881)	$ 486,488
Beginning balance (in shares) at Jun. 30, 2022	46,684,583
Increase (decrease) in shareholders' equity
Income / Loss for the period				(47,857)	(47,857)
Other comprehensive loss			(25,370)		(25,370)
Exercise of share options	$ 2	258			260
Exercise of share options (in shares)	47,290
Restricted and performance share units distributed during the period	$ 4	(4)
Restricted and performance share units distributed during the period (in shares)	79,821
Share-based compensation expense		7,608			7,608
Issuance of ordinary shares relating to employee stock purchase plan	$ 1	40			41
Issuance of ordinary shares relating to employee stock purchase plan (in shares)	3,415
Ending balance at Sep. 30, 2022	$ 2,830	$ 1,100,078	$ (93,000)	$ (588,738)	$ 421,170
Ending balance (in shares) at Sep. 30, 2022	46,815,109				46,815,109