Condensed Consolidated Statement of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Common Shares	Treasury Stock	Additional Paid-in Capital	Accumulated Deficit
Balance at Dec. 31, 2021	$ 667,099	$ 294,027	$ (60,726)	$ 1,855,246	$ (1,421,448)
Balance (in shares) at Dec. 31, 2021		404,084,775
Balance, Treasury Shares (in shares) at Dec. 31, 2021			(7,486,767)
Exercise of stock options	$ 30	$ 6		24
Exercise of stock options (in shares)	10,602	10,602
Vesting of restricted stock units	$ (535)	$ 331	$ (535)	(331)
Vesting of restricted stock units (in shares)		493,381	(161,083)
Stock-based compensation	6,078			6,078
Loss for the period	(31,563)				(31,563)
Balance at Mar. 31, 2022	641,109	$ 294,364	$ (61,261)	1,861,017	(1,453,011)
Balance (in shares) at Mar. 31, 2022		404,588,758
Balance, Treasury Shares (in shares) at Mar. 31, 2022			(7,647,850)
Balance at Dec. 31, 2022	$ 595,333	$ 299,002	$ (61,770)	1,885,352	(1,527,251)
Balance (in shares) at Dec. 31, 2022		412,333,087
Balance, Treasury Shares (in shares) at Dec. 31, 2022	7,986,831		(7,986,831)
Exercise of stock options	$ 1,871	$ 744		1,127
Exercise of stock options (in shares)	1,232,263	1,232,263
Vesting of restricted stock units	$ (1,507)	$ 1,539	$ (1,507)	(1,539)
Vesting of restricted stock units (in shares)		2,514,948	(827,523)
Stock-based compensation	5,556			5,556
Loss for the period	(16,460)				(16,460)
Balance at Mar. 31, 2023	$ 584,793	$ 301,285	$ (63,277)	$ 1,890,496	$ (1,543,711)
Balance (in shares) at Mar. 31, 2023		416,080,298
Balance, Treasury Shares (in shares) at Mar. 31, 2023	8,814,354		(8,814,354)