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Unaudited Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities
Net loss	$ (108,766)	$ (71,187)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Amortization of lease incentive obligation	(501)	(131)
Depreciation of property and equipment	3,867	1,266
Share-based compensation expense	11,585	8,966
Net (gain) loss on disposal of property and equipment	44
Deferred rent	900	3,207
Deferred income taxes		904
Changes in operating assets and liabilities:
Accounts receivable	(59,000)
Prepaid expenses and other current assets	(5,687)	(3,887)
Other non-current assets	(15)	(7)
Accounts payable	2,801	624
Accrued expenses and other current liabilities	647	1,898
Deferred revenue	164,207	(2,795)
Other non-current liabilities	(124)	225
Net cash provided by (used in) operating activities	9,958	(60,917)
Cash flows from investing activities
Purchases of property and equipment	(6,475)	(14,808)
Net cash used in investing activities	(6,475)	(14,808)
Cash flows from financing activities
Proceeds from issuance of ordinary shares, net of offering costs	60,000	93,509
Payments on capital lease obligation	(16)	(47)
Proceeds from the exercise of share options	4,464	323
Net cash provided by financing activities	64,448	93,785
Effect of foreign exchange rates on cash, cash equivalents and restricted cash	65	118
Net increase in cash, cash equivalents and restricted cash	67,996	18,178
Cash, cash equivalents and restricted cash, beginning of period	146,113	153,894
Cash, cash equivalents and restricted cash, end of period	214,109	172,072
Supplemental disclosure of cash flow information:
Cash paid for taxes, net of refunds	438	211
Property and equipment purchases in accounts payable and accrued expenses at period end	1,853	1,419
Tenant improvements paid for by the landlord during the period	2,732	$ 2,774
Tenant improvements to be reimbursed by the landlord	$ 4,302

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