Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash flows from operating activities
Net loss	$ (1,782,712)	$ (413,242)
Adjustments to reconcile net loss to net cash used in operating activities
Depreciation and amortization	54,215	2,836
Stock-based compensation	1,152,724	3,497
Amortization of premium on marketable securities	151	363
Accretion of discount on marketable securities	(21,357)	(8,056)
Other	7,463	298
Changes in operating assets and liabilities
Prepaid expenses and other assets	(79,712)	(46,912)
Operating lease right-of-use assets	39,951
Accounts payable	(22,403)	(2,102)
Insurance reserves	397,107	198,379
Accrued and other liabilities	212,083	153,349
Lease liabilities	(27,021)
Net cash used in operating activities	(69,511)	(111,590)
Cash flows from investing activities
Purchases of marketable securities	(3,581,779)	(2,874,656)
Purchase of term deposit	(105,000)
Proceeds from sales of marketable securities	647,138	685,323
Proceeds from maturities of marketable securities	1,391,360	1,296,457
Purchases of property and equipment and scooter fleet	(68,285)	(11,209)
Purchases of other intangible assets		(2,200)
Cash paid for acquisitions, net of cash acquired	(1,801)
Other investing activities	780
Net cash used in investing activities	(1,717,587)	(906,285)
Cash flows from financing activities
Proceeds from issuance of common stock in initial public offering, net of underwriting commissions, offering costs and reimbursements	2,484,230
Proceeds from issuance of redeemable convertible preferred stock, net of issuance costs		807,369
Proceeds from exercise of stock options and other common stock issuances	2,541	4,351
Taxes paid related to net share settlement of equity awards	(863,955)
Net cash provided by financing activities	1,622,816	811,720
Effect of foreign exchange on cash, cash equivalents and restricted cash and cash equivalents	296	(137)
Net decrease in cash, cash equivalents and restricted cash and cash equivalents	(163,986)	(206,292)
Beginning of period	706,486	1,178,919
End of period	542,500	972,627
Non-cash investing and financing activities
Purchases of property and equipment, and scooter fleet not yet settled	11,504	$ 10,078
Deferred offering costs accrued, unpaid	201
Right of use assets acquired under operating leases	99,550
Conversion of redeemable convertible preferred stock to common stock in connection with initial public offering	5,152,047
Reclassification of deferred offering costs to additional paid-in capital upon initial public offering	$ 7,690