Consolidated Statements of Changes in Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common stock	Treasury stock	Additional paid-in capital	Accumulated deficit	Accumulated other comprehensive income (loss)
Balance at Dec. 31, 2020	$ 237,955	$ 9	$ (638)	$ 1,007,790	$ (766,403)	$ (2,803)
Balance (in shares) at Dec. 31, 2020		9,476
Compensation expense for issuance of stock options to employees	1,635			1,635
Compensation expense and issuance of restricted stock to employees	1,295			1,295
Compensation expense and issuance of restricted stock to employees (in shares)		89
Interest payment for convertible notes	12,420	$ 4		12,416
Interest payment for convertible notes (in shares)		3,685
Other comprehensive (loss) income, net of tax	1,786					1,786
Net loss	(103,954)				(103,954)
Balance at Dec. 31, 2021	151,137	$ 13	(638)	1,023,136	(870,357)	(1,017)
Balance (in shares) at Dec. 31, 2021		13,250
Compensation expense for issuance of stock options to employees	1,496			1,496
Compensation expense and issuance of restricted stock to employees	(3)			(3)
Compensation expense and issuance of restricted stock to employees (in shares)		101
Interest payment for convertible notes	5,263	$ 11		5,252
Interest payment for convertible notes (in shares)		10,992
Other comprehensive (loss) income, net of tax	1,645					1,645
Net loss	(65,916)				(65,916)
Balance at Dec. 31, 2022	$ 93,622	$ 24	$ (638)	$ 1,029,881	$ (936,273)	$ 628
Balance (in shares) at Dec. 31, 2022		24,343