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Employee Benefits and Share-Based Compensation - Stock Award Plans (Details) shares in Thousands | 12 Months Ended
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Dec. 31, 2017 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Shares reserved for future issuance (in shares) | 7,835
2009 Plan |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Shares reserved for future issuance (in shares) | 5,500
2009 Plan | Vesting one year from the vesting commencement date |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Percentage of award vesting | 25.00%
2009 Plan | Employee Stock Option |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting period (in years) | 4 years
Shares reserved for future issuance (in shares) | 3,323
2009 Plan | Employee Stock Option | Vesting one year from the vesting commencement date |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting period (in years) | 1 year
2009 Plan | Employee Stock Option | Vesting in equal monthly installments |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Monthly vesting installments | 36 months

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- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Percentage of vesting of share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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