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Supplemental Financial Statement Information - Property and Equipment (Detail) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 20,724 $ 22,434
Less: Accumulated depreciation and amortization (17,411) (18,384)
Property and equipment, net 3,313 4,050
Computer and Other Related Equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 14,458 14,939
Purchased and Internally Developed Software    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 4,721 3,090
Furniture and Fixtures    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 546 1,273
Leasehold Improvements    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 972 1,732
Construction in Progress    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 27 $ 1,400