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Employee Benefits and Share-Based Compensation - Summary of Shares Reserved for Future Issuance Under Equity Incentive Plans (Details) shares in Thousands | Dec. 31, 2017 shares
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Total shares reserved for future issuance | 7,835
1997 Employee Stock Purchase Plan | ESPP shares available for future issuance |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Total shares reserved for future issuance | 2,365
2009 Plan |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Total shares reserved for future issuance | 5,500
2009 Plan | Share options outstanding |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Total shares reserved for future issuance | 3,323
2009 Plan | Non-vested restricted stock awards |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Total shares reserved for future issuance | 749
2009 Plan | Shares authorized for future issuance |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Total shares reserved for future issuance | 1,398

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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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