CONSOLDATED STATEMENTS OF STOCKHOLDERS' DEFICIT - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Treasury Stock [Member]
Balances at beginning of period (in shares) at Dec. 31, 2020		44,420,000				0
Balances at beginning of period at Dec. 31, 2020	$ (132,924)	$ 442	$ 1,036,658	$ (1,168,347)	$ (1,677)
Stock issued pursuant to employee stock plans (in shares)		592,000
Stock issued pursuant to employee stock plans, net of shares withheld for employee tax obligations	(7,706)	$ 6	(7,712)
Stock-based compensation	3,122		3,122
Net income	4,391			4,391
Other comprehensive income (loss)	(1,457)				(1,457)
Balances at end of period (in shares) at Mar. 31, 2021		45,012,000				0
Balances at end of period at Mar. 31, 2021	$ (134,574)	$ 448	1,032,068	(1,163,956)	(3,134)
Balances at beginning of period (in shares) at Dec. 31, 2021	44,954,000	45,828,000				(874,000)
Balances at beginning of period at Dec. 31, 2021	$ (124,074)	$ 455	1,031,633	(1,126,959)	(4,113)	$ (25,090)
Stock issued pursuant to employee stock plans (in shares)		391,000
Stock issued pursuant to employee stock plans, net of shares withheld for employee tax obligations	$ (8,936)	$ 4	(8,940)
Repurchase of common stock (in shares)	(354,472)					(354,000)
Repurchase of common stock	$ (10,816)					$ (10,816)
Stock-based compensation	3,422		3,422
Net income	10,586			10,586
Other comprehensive income (loss)	$ (201)				(201)
Balances at end of period (in shares) at Mar. 31, 2022	44,991,000	46,219,000				(1,228,000)
Balances at end of period at Mar. 31, 2022	$ (130,019)	$ 459	$ 1,026,115	$ (1,116,373)	$ (4,314)	$ (35,906)