Additions made to capitalized computer software costs during the period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Section 50
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For each income statement presented, the amount charged to expense for amortization of capitalized computer software costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 985
-SubTopic 20
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128487-111756

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The Company and Summary of Significant Accounting Policies - Internal Use Software (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Internal Use Software [Abstract]
Capitalized internal use software costs	$ 728	$ 615	$ 2,165
Amortization of capitalized software costs	$ 998	$ 1,155	$ 950
Capitalized software costs
Internal Use Software [Abstract]
Intangible assets estimated useful life	3 years
Minimum
Internal Use Software [Abstract]
Intangible assets estimated useful life	1 year
Maximum
Internal Use Software [Abstract]
Intangible assets estimated useful life	9 years