Stockholders' Equity - Components of Stockholders' Equity (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Beginning Balance	$ 147,434	$ 230,931	$ 229,537	$ 240,265
Beginning Balance, Shares			6,282,000
Issuance of common stock under stock plans, including tax effects	$ (441)	(83)	$ (206)	(259)
Repurchases of common stock		$ (3,918)		$ (8,015)
Repurchases of common stock, Shares	0	200,000	0	400,000
Stock-based compensation expense	$ 3,649	$ 4,025	$ 6,121	$ 7,599
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member		us-gaap:AccountingStandardsUpdate201613Member
Net Income (Loss)	$ 3,913	6,292	$ (83,359)	(381)
Net change in marketable investments, net of tax	4	18	8	24
Foreign currency translation	4,980	(211)	7,438	(2,179)
Ending Balance	$ 159,539	237,054	$ 159,539	237,054
Ending Balance, Shares	6,282,000		6,282,000
Common Stock [Member]
Beginning Balance	$ 253	$ 249	$ 251	$ 247
Beginning Balance, Shares	25,262,000	24,881,000	25,119,000	24,684,000
Issuance of common stock under stock plans, including tax effects	$ 1		$ 3	$ 2
Issuance of common stock under stock plans, including tax effects, Shares	99,000	16,000	242,000	213,000
Ending Balance	$ 254	$ 249	$ 254	$ 249
Ending Balance, Shares	25,361,000	24,897,000	25,361,000	24,897,000
Additional Paid-in Capital [Member]
Beginning Balance	$ 294,922	$ 281,453	$ 292,217	$ 278,057
Issuance of common stock under stock plans, including tax effects	(442)	(83)	(209)	(261)
Stock-based compensation expense	3,649	4,025	6,121	7,599
Ending Balance	298,129	285,395	298,129	285,395
Retained Earnings [Member]
Beginning Balance	84,662	171,008	171,934	177,681
Net Income (Loss)	3,913	6,292	(83,359)	(381)
Ending Balance	88,575	177,300	88,575	177,300
Treasury Stock [Member]
Beginning Balance	$ (227,119)	$ (215,246)	$ (227,119)	$ (211,149)
Beginning Balance, Shares	6,282,000	5,639,000	6,282,000	5,437,000
Repurchases of common stock		$ (3,918)		$ (8,015)
Repurchases of common stock, Shares		202,000		404,000
Ending Balance	$ (227,119)	$ (219,164)	$ (227,119)	$ (219,164)
Ending Balance, Shares	6,282,000	5,841,000	6,282,000	5,841,000
Accumulated Other Comprehensive Loss [Member]
Beginning Balance	$ (5,284)	$ (6,533)	$ (7,746)	$ (4,571)
Net change in marketable investments, net of tax	4	18	8	24
Foreign currency translation	4,980	(211)	7,438	(2,179)
Ending Balance	$ (300)	$ (6,726)	$ (300)	$ (6,726)