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Certain Balance Sheet Accounts - Summary of Property and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Property Plant And Equipment [Line Items]
Total property and equipment	$ 84,956	$ 84,205
Less accumulated depreciation	(62,951)	(58,956)
Total property and equipment, net	22,005	25,249
Computers and Equipment [Member]
Property Plant And Equipment [Line Items]
Total property and equipment	18,621	18,570
Computer Software [Member]
Property Plant And Equipment [Line Items]
Total property and equipment	31,276	29,891
Furniture and Fixtures [Member]
Property Plant And Equipment [Line Items]
Total property and equipment	8,449	9,094
Leasehold Improvements [Member]
Property Plant And Equipment [Line Items]
Total property and equipment	$ 26,610	$ 26,650

X

- Definition

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

+ References

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- Definition

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.

+ References

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