Consolidated Statements of Changes in Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)
Balances, in shares at Dec. 31, 2021		256,919
Balances at Dec. 31, 2021	$ 800,262	$ 2,569	$ 3,738,347	$ (2,939,442)	$ (1,212)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	7,682			7,682
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(4,758)				(4,758)
Common stock issued for investment (in shares)		22,053
Common stock issued under stock-based compensation plans, net (in shares)		1,862
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	(1,711)	$ 19	(1,730)
Balances, in shares at Mar. 31, 2022		280,834
Balances at Mar. 31, 2022	899,974	$ 2,808	3,834,896	(2,931,760)	(5,970)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued under "at the market" stock offering	98,499	$ 220	98,279
Balances, in shares at Dec. 31, 2022		295,698
Balances at Dec. 31, 2022	889,016	$ 2,957	3,891,265	(3,017,549)	12,343
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(24,586)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(17,062)				(17,062)
Common stock issued for investment (in shares)		32,862
Common stock issued under stock-based compensation plans, net (in shares)		2,482
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	739	$ 24	715
Balances, in shares at Mar. 31, 2023		331,042
Balances at Mar. 31, 2023	946,536	$ 3,310	3,990,080	$ (3,042,135)	$ (4,719)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued under "at the market" stock offering	$ 98,429	$ 329	$ 98,100