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Supplemental Financial Statement Information - Property and Equipment (Detail) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 21,685 $ 19,628
Less: Accumulated depreciation and amortization (17,846) (16,811)
Property and equipment, net 3,839 2,817
Computer and Other Related Equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 14,624 13,373
Purchased and Internally Developed Software    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 3,090 2,483
Furniture and Fixtures    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 1,271 1,271
Leasehold Improvements    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 1,732 1,732
Construction in Progress    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 968 $ 769