Consolidated Statements of Equity (Unaudited) - USD ($) $ in Thousands		Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Loss [Member]	Retained Deficit [Member]
Balance at Dec. 31, 2021		$ 896,692	$ 864	$ 1,049,696	$ 1,317	$ (155,185)
Balance, Shares at Dec. 31, 2021			86,423,000
Net income (loss)		(21,188)				(21,188)
Net loss attributable to noncontrolling interest		(4)
Dissolution of and net loss attributable to noncontrolling interest	[1]	(203)		10		(213)
Unrealized holding loss (gain) on investments, net of tax		(2,668)			(2,668)
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan		1,174		1,174
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan, shares			50,000
Issuance of restricted stock			$ 8	(8)
Issuance of restricted stock, shares			766,000
Forfeitures of restricted stock, shares			(5,000)
Stock-based compensation expense		4,435		4,435
Repurchased common stock		(1,166)		(1,166)
Repurchased common stock, shares			(50,000)
Balance at Mar. 31, 2022		877,076	$ 872	1,054,141	(1,351)	(176,586)
Balance, Shares at Mar. 31, 2022			87,184,000
Balance at Dec. 31, 2022		891,632	$ 829	983,601	(3,735)	(89,063)
Balance, Shares at Dec. 31, 2022			82,947,000
Net income (loss)		14,206				14,206
Net loss attributable to noncontrolling interest		0
Unrealized holding loss (gain) on investments, net of tax		604			604
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan		1,095		1,095
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan, shares			86,000
Issuance of restricted stock			$ 9	(9)
Issuance of restricted stock, shares			871,000
Forfeitures of restricted stock			$ (2)	2
Forfeitures of restricted stock, shares			(221,000)
Stock-based compensation expense		3,009		3,009
Repurchased common stock		$ (775)		(775)
Repurchased common stock, shares		0	(49,000)
Balance at Mar. 31, 2023		$ 909,771	$ 836	$ 986,923	$ (3,131)	$ (74,857)
Balance, Shares at Mar. 31, 2023			83,634,000

[1] Net loss component is presented within retained deficit on the consolidated balance sheet as the balance is immaterial.