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	$ (82,596)	$ (52,672)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization expense	7,943	4,605
Loss on disposal of property and equipment	49	103
Provision for bad debt and valuation allowance	1,385	597
Gain on loan sales	(19,200)	(9,891)
Equity-based compensation expense	7,711	1,510
Amortization and write-off of debt issuance costs	979	323
Originations of finance receivables	(532,066)	(228,595)
Principal payments received on finance receivables held for sale	11,227	0
Proceeds from sale of finance receivables, net	601,557	220,357
Purchase of finance receivables	(127,710)	0
Changes in assets and liabilities:
Accounts receivable	(5,435)	(6,969)
Vehicle inventory	(112,536)	(72,030)
Other current assets	(13,111)	(2,998)
Other assets	238	297
Operating lease right-of-use assets	(1,262)
Accounts payable and accrued liabilities	46,784	12,957
Accounts payable to related party	1,848	800
Operating lease liabilities	68
Other liabilities	(382)	157
Net cash used in operating activities	(214,509)	(131,449)
Cash Flows from Investing Activities:
Purchases of property and equipment, including $4,257 and $0 from related parties	(43,199)	(28,011)
Net cash used in investing activities	(43,199)	(28,011)
Cash Flows from Financing Activities:
Proceeds from floor plan facility	807,890	393,119
Payments on floor plan facility	(570,076)	(293,378)
Proceeds from long-term debt	41,817	15,608
Payments on long-term debt	(3,003)	(1,309)
Payments of debt issuance costs	(567)	(141)
Proceeds from exercise of stock options	426	63
Tax withholdings related to restricted stock awards	(433)	(160)
Dividends paid	0	(1,528)
Net proceeds from issuance of Class A Convertible Preferred Stock	0	(163)
Net cash provided by financing activities	276,054	112,262
Net increase (decrease) in cash, cash equivalents and restricted cash	18,346	(47,198)
Cash, cash equivalents and restricted cash at beginning of period	88,709	187,123
Cash, cash equivalents and restricted cash at end of period	107,055	139,925
Class A Convertible Preferred Stock
Cash Flows from Financing Activities:
Dividends paid		(1,500)
Net proceeds from issuance of Class A Convertible Preferred Stock	$ 0	$ (12)