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, 2020	$ 627,505	$ 290,115	$ (51,082)	$ 1,817,649	$ (1,429,177)
Balance (in shares) at Dec. 31, 2020		398,425,000
Balance, Treasury Shares (in shares) at Dec. 31, 2020			(5,886,919)
Exercise of stock options	2,059	$ 536		1,523
Exercise of stock options (in shares)		783,320
Vesting of restricted stock units	(7,252)	$ 1,709	$ (7,252)	(1,709)
Vesting of restricted stock units (in shares)		2,447,405	(1,003,965)
Stock-based compensation	13,925			13,925
Income (Loss) for the period	(1,626)				(1,626)
Balance at Mar. 31, 2021	634,611	$ 292,360	$ (58,334)	1,831,388	(1,430,803)
Balance (in shares) at Mar. 31, 2021		401,655,725
Balance, Treasury Shares (in shares) at Mar. 31, 2021			(6,890,884)
Balance at Dec. 31, 2020	$ 627,505	$ 290,115	$ (51,082)	1,817,649	(1,429,177)
Balance (in shares) at Dec. 31, 2020		398,425,000
Balance, Treasury Shares (in shares) at Dec. 31, 2020			(5,886,919)
Exercise of stock options (in shares)	810,459
Income (Loss) for the period	$ 6,182
Balance at Jun. 30, 2021	645,324	$ 292,782	$ (59,011)	1,834,548	(1,422,995)
Balance (in shares) at Jun. 30, 2021		402,255,276
Balance, Treasury Shares (in shares) at Jun. 30, 2021			(7,033,088)
Balance at Mar. 31, 2021	634,611	$ 292,360	$ (58,334)	1,831,388	(1,430,803)
Balance (in shares) at Mar. 31, 2021		401,655,725
Balance, Treasury Shares (in shares) at Mar. 31, 2021			(6,890,884)
Issuance of common stock under employee stock purchase plan	1,028	$ 161		867
Issuance of common stock under employee stock purchase plan (in shares)		226,402
Exercise of stock options	75	$ 19		56
Exercise of stock options (in shares)		27,139
Vesting of restricted stock units	(677)	$ 242	$ (677)	(242)
Vesting of restricted stock units (in shares)		346,010	(142,204)
Stock-based compensation	2,479			2,479
Income (Loss) for the period	7,808				7,808
Balance at Jun. 30, 2021	645,324	$ 292,782	$ (59,011)	1,834,548	(1,422,995)
Balance (in shares) at Jun. 30, 2021		402,255,276
Balance, Treasury Shares (in shares) at Jun. 30, 2021			(7,033,088)
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		(7,486,767)
Exercise of stock options	$ 30	$ 6		24
Exercise of stock options (in shares)		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
Income (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, 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		(7,486,767)
Exercise of stock options (in shares)	25,247
Income (Loss) for the period	$ (101,519)
Balance at Jun. 30, 2022	$ 580,043	$ 294,659	$ (61,419)	1,869,770	(1,522,967)
Balance (in shares) at Jun. 30, 2022		405,056,452
Balance, Treasury Shares (in shares) at Jun. 30, 2022	7,709,401		(7,709,401)
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)
Issuance of common stock under employee stock purchase plan	383	$ 166		217
Issuance of common stock under employee stock purchase plan (in shares)		265,214
Exercise of stock options	19	$ 9		10
Exercise of stock options (in shares)		14,645
Vesting of restricted stock units	(158)	$ 120	$ (158)	(120)
Vesting of restricted stock units (in shares)		187,835	(61,551)
Stock-based compensation	8,646			8,646
Income (Loss) for the period	(69,956)				(69,956)
Balance at Jun. 30, 2022	$ 580,043	$ 294,659	$ (61,419)	$ 1,869,770	$ (1,522,967)
Balance (in shares) at Jun. 30, 2022		405,056,452
Balance, Treasury Shares (in shares) at Jun. 30, 2022	7,709,401		(7,709,401)