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Supplemental Financial Statement Information - Property and Equipment (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 19,135	$ 18,344
Less: Accumulated depreciation and amortization	(16,510)	(15,597)
Property and equipment, net	2,625	2,747
Computer and Other Related Equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	13,286	13,278
Purchased and Internally Developed Software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	2,846	2,058
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	$ 1,737

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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