Stockholders' Equity - Components of Stockholders' Equity (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Beginning Balance	$ 229,537	$ 240,265
Beginning Balance, Shares	6,282,000
Issuance of common stock under stock plans, including tax effects	$ 235	(176)
Repurchases of common stock		$ (4,097)
Repurchases of common stock, Shares	0	200,000
Stock-based compensation expense	$ 2,472	$ 3,574
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Net Income (Loss)	$ (87,272)	(6,673)
Net change in marketable investments, net of tax	4	6
Foreign currency translation	2,458	(1,968)
Ending Balance	$ 147,434	230,931
Ending Balance, Shares	6,282,000
Common Stock [Member]
Beginning Balance	$ 251	$ 247
Beginning Balance, Shares	25,119,000	24,684,000
Issuance of common stock under stock plans, including tax effects	$ 2	$ 2
Issuance of common stock under stock plans, including tax effects, Shares	143,000	197,000
Ending Balance	$ 253	$ 249
Ending Balance, Shares	25,262,000	24,881,000
Additional Paid-in Capital [Member]
Beginning Balance	$ 292,217	$ 278,057
Issuance of common stock under stock plans, including tax effects	233	(178)
Stock-based compensation expense	2,472	3,574
Ending Balance	294,922	281,453
Retained Earnings [Member]
Beginning Balance	171,934	177,681
Net Income (Loss)	(87,272)	(6,673)
Ending Balance	84,662	171,008
Treasury Stock [Member]
Beginning Balance	$ (227,119)	$ (211,149)
Beginning Balance, Shares	6,282,000	5,437,000
Repurchases of common stock		$ (4,097)
Repurchases of common stock, Shares		202,000
Ending Balance	$ (227,119)	$ (215,246)
Ending Balance, Shares	6,282,000	5,639,000
Accumulated Other Comprehensive Loss [Member]
Beginning Balance	$ (7,746)	$ (4,571)
Net change in marketable investments, net of tax	4	6
Foreign currency translation	2,458	(1,968)
Ending Balance	$ (5,284)	$ (6,533)