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Balance Sheet Accounts (Schedule of Property and Equipment) (Details) - USD ($) $ in Thousands		Dec. 31, 2017	Dec. 31, 2016
Balance Sheet Related Disclosures [Abstract]
Computer equipment and software		$ 17,112	$ 17,524
Office equipment and furniture		3,583	3,490
Leasehold improvements		3,156	3,173
Property and equipment, gross		23,851	24,187
Less accumulated depreciation and amortization		(19,146)	(18,579)
Property and equipment, net	[1]	$ 4,705	$ 5,608
[1] As adjusted for the adoption of ASC 606 using the full retrospective method

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Computer Equipment and Software

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Office furniture and equipment

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
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-Publisher FASB
-Name Accounting Standards Codification
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-Section S99
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-Subparagraph (SX 210.5-02.14)
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Amount before accumulated depreciation of additions or improvements to assets held under a lease arrangement.

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