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Unaudited Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Cash flows from operating activities    
Net loss $ (71,824) $ (36,947)
Adjustments to reconcile net loss to net cash used in operating activities:    
Amortization of lease incentive obligation (131)  
Depreciation of property and equipment 1,266 525
Share-based compensation expense 8,966 4,319
Deferred rent 3,207 371
Tax benefit related to share-based compensation   (67)
Deferred income taxes 774 178
Changes in operating assets and liabilities:    
Accounts receivable   (2,500)
Prepaid expenses and other current assets (3,887) (466)
Other non-current assets (7) (53)
Accounts payable 624 1,899
Accrued expenses and other current liabilities 1,898 2,484
Deferred revenue (2,028) 11,692
Other non-current liabilities 225 (13)
Net cash used in operating activities (60,917) (18,578)
Cash flows from investing activities    
Increase in restricted cash (7)  
Proceeds from the sale of property and equipment   4
Purchases of property and equipment (14,808) (2,838)
Net cash used in investing activities (14,815) (2,834)
Cash flows from financing activities    
Proceeds from issuance of ordinary shares, net of offering costs 93,509 30,000
Costs associated with initial public offering   (1,075)
Payments on capital lease obligation (47) (47)
Tax benefit related to share-based compensation   67
Proceeds from the exercise of share options 323 161
Net cash provided by financing activities 93,785 29,106
Effect of foreign exchange rates on cash 118 101
Net increase in cash and cash equivalents 18,171 7,795
Cash and cash equivalents at beginning of period 150,293 161,220
Cash and cash equivalents at end of period 168,464 169,015
Supplemental disclosure of cash flow information:    
Tenant improvements paid for by the landlord during the period 2,774  
Property and equipment purchases in accounts payable and accrued expenses at period end $ 1,419 $ 1,595