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Stockholders' Equity - Components of Stockholders' Equity (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Beginning Balance $ 126,525 $ 229,537
Beginning Balance, Shares 6,522,000  
Issuance of common stock under stock plans, including tax effects $ 280 235
Stock-based compensation expense 2,554 2,472
Net Income (Loss) (21,825) (87,272)
Net change in marketable investments, net of tax (60) 4
Foreign currency translation (1,420) 2,458
Ending Balance $ 106,054 147,434
Ending Balance, Shares 6,522,000  
Common Stock [Member]    
Beginning Balance $ 255 $ 251
Beginning Balance, Shares 25,535,000 25,119,000
Issuance of common stock under stock plans, including tax effects $ 2 $ 2
Issuance of common stock under stock plans, including tax effects, Shares 162,000 143,000
Ending Balance $ 257 $ 253
Ending Balance, Shares 25,697,000 25,262,000
Additional Paid-in Capital [Member]    
Beginning Balance $ 304,404 $ 292,217
Issuance of common stock under stock plans, including tax effects 278 233
Stock-based compensation expense 2,554 2,472
Ending Balance 307,236 294,922
Retained Earnings [Member]    
Beginning Balance 52,574 171,934
Net Income (Loss) (21,825) (87,272)
Ending Balance 30,749 84,662
Treasury Stock [Member]    
Beginning Balance $ (229,615) $ (227,119)
Beginning Balance, Shares 6,522,000 6,282,000
Ending Balance $ (229,615) $ (227,119)
Ending Balance, Shares 6,522,000 6,282,000
Accumulated Other Comprehensive Loss [Member]    
Beginning Balance $ (1,093) $ (7,746)
Net change in marketable investments, net of tax (60) 4
Foreign currency translation (1,420) 2,458
Ending Balance $ (2,573) $ (5,284)