Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Operating activities
Net loss	$ (79,804)	$ (33,232)
Adjustments to reconcile net loss to net cash used in operating activities
Depreciation and amortization	3,809	3,902
Stock-based compensation	12,282	8,974
Amortization of debt discount and issuance costs	3,031	0
Non-cash lease expense	2,943	0
Other	(100)	0
Change in assets and liabilities
Accrued revenue	(23,323)	(5,568)
Inventory	(62,960)	(11,137)
Prepaid expenses and other assets	1,230	3,682
Accounts payable	1,350	1,934
Accrued liabilities and other payables	26,494	7,481
Operating lease liabilities	(3,301)
Deferred rent	(5)	(583)
Origination of loans held for sale	(153,335)	(29,249)
Proceeds from sale of loans originated as held for sale	128,080	27,555
Net cash used in operating activities	(143,609)	(26,241)
Investing activities
Purchases of investments	(70,312)	0
Sales of investments	100	0
Purchases of property and equipment	(9,504)	(4,045)
Net cash used in investing activities	(79,716)	(4,045)
Financing activities
Proceeds from the exercise of stock options	8,965	14,394
Tax payments related to net share settlements on restricted stock units	(1,792)	(227)
Borrowings from warehouse credit facilities	149,900	28,551
Repayments of warehouse credit facilities	(125,206)	(27,076)
Other payables - deposits held in escrow	11,602	13,631
Net cash provided by financing activities	43,469	29,273
Effect of exchange rate changes on cash and cash equivalents	38	0
Net change in cash, cash equivalents, and restricted cash	(179,818)	(1,013)
Cash, cash equivalents, and restricted cash
Beginning of period	439,055	212,658
End of period	259,237	211,645
Supplemental disclosure of cash flow information
Cash paid for interest	1,202	0
Non-cash transactions
Stock-based compensation capitalized in property and equipment	(561)	(244)
Property and equipment additions in accounts payable and accrued liabilities	(620)	(21)
Leasehold improvements paid directly by lessor	$ (3,444)	$ (926)