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Property and Equipment (Detail) - USD ($) $ in Thousands		Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Property and equipment, gross	[1]	$ 19,628	$ 18,344
Less: accumulated depreciation and amortization	[1]	(16,811)	(15,597)
Property and equipment, net	[1]	2,817	2,747
Computer and Other Related Equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	[1]	13,373	12,948
Purchased and Internally Developed Software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	[1]	2,483	2,058
Furniture and Fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	[1]	1,271	1,271
Leasehold Improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	[1]	1,732	1,737
Construction in Progress
Property, Plant and Equipment [Line Items]
Property and equipment, gross	[1]	$ 769	$ 330
[1] Includes the original cost of fully-depreciated fixed assets which were $13.6 million and $10.9 million at December 31, 2020 and 2021, respectively.

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