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Property and Equipment (Detail) - USD ($) $ in Thousands		Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Property and equipment, gross	[1]	$ 18,344	$ 24,099
Less: accumulated depreciation and amortization	[1]	(15,597)	(21,104)
Property and equipment, net	[1]	2,747	2,995
Computer and Other Related Equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	[1]	13,278	19,274
Purchased and Internally Developed Software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	[1]	2,058	2,055
Furniture and Fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	[1]	1,271	1,033
Leasehold Improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	[1]	$ 1,737	$ 1,737
[1] Includes the original cost of fully-depreciated fixed assets which were $19.6 million and $ 13.6 million at December 31, 2019 and 2020, respectively.

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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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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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