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Financial Statement Components - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Property, Plant and Equipment [Line Items] |  |  |
Depreciation and amortization of property and equipment | $ 7.8 | $ 7.9 | $ 6.9
Favorable impact to basic and diluted EPS related to change in estimated useful life (in USD per share) | $ (0.16) | $ (0.23) | $ (0.52)
Previously reported |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful life, in years | 3 years |  |
Service life | Adjustments |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Depreciation and amortization of property and equipment | $ (1.6) |  |
Favorable impact to basic and diluted EPS related to change in estimated useful life (in USD per share) | $ 0.03 |  |
Minimum | Service life |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful life, in years | 3 years |  |
Maximum | Service life |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful life, in years | 5 years |  |

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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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- Definition The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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