Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities
Net loss	$ (1,138,473)	$ (234,339)
Adjustments to reconcile net loss to net cash used in operating activities
Depreciation and amortization	23,135	1,138
Stock-based compensation	859,486	1,996
Amortization of premium on marketable securities	24	213
Accretion of discount on marketable securities	(10,081)	(3,753)
Other	103	10
Changes in operating assets and liabilities
Prepaid expenses and other assets	(46,307)	(7,272)
Operating lease right-of-use assets	19,518
Accounts payable	1,161	(13,270)
Insurance reserves	126,711	89,730
Accrued and other liabilities	94,238	85,924
Lease liabilities	(14,342)
Net cash used in operating activities	(84,827)	(79,623)
Cash flows from investing activities
Purchases of marketable securities	(607,190)	(1,198,192)
Proceeds from sales of marketable securities	466,174	181,648
Proceeds from maturities of marketable securities	838,177	200,499
Purchases of property and equipment and scooter fleet	(25,126)	(3,088)
Cash paid for acquisitions, net of cash acquired	(1,711)
Net cash provided by (used in) investing activities	670,324	(819,133)
Cash flows from financing activities
Proceeds from issuance of redeemable convertible preferred stock, net of issuance costs		54,196
Proceeds from exercise of stock options and other common stock issuances	1,601	1,346
Taxes paid related to net share settlement of equity awards	(784,724)
Payment of deferred offering costs	(5,044)
Net cash provided by (used in) financing activities	(788,167)	55,542
Effect of foreign exchange on cash, cash equivalents and restricted cash and cash equivalents	102	(46)
Net decrease in cash, cash equivalents and restricted cash and cash equivalents	(202,568)	(843,260)
Beginning of period	706,486	1,178,919
End of period	503,918	335,659
Non-cash investing and financing activities
Purchases of property and equipment, and scooter fleet not yet settled	16,612	$ 10,472
Right of use assets acquired under operating leases	38,488
Deferred offering costs in accounts payable and accrued liabilities	$ 2,240