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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
Jun. 30, 2018
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Total shares reserved for future issuance 9,615
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 2,077
2009 Plan | Share options outstanding  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Total shares reserved for future issuance 3,509
2009 Plan | Non-vested restricted share awards  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Total shares reserved for future issuance 723
2009 Plan | Shares authorized for future issuance  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Total shares reserved for future issuance 3,306