Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash Flows from Operating Activities:
Net loss	$ (103,922)	$ (77,309)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization expense	9,862	4,645
Loss on disposal of property and equipment	267	565
Provision for bad debt and finance receivable allowance	1,131	494
Gain on loan sales	(22,313)	(8,390)
Equity-based compensation expense	4,093	2,102
Amortization and write-off of debt issuance costs	649	1,250
Originations of finance receivables	(525,885)	(223,843)
Proceeds from sale of finance receivables	513,820	231,942
Changes in assets and liabilities:
Accounts receivable	(9,500)	(8,293)
Vehicle inventory	(74,817)	11,668
Other current assets	(7,397)	(1,538)
Other assets	270	(1,148)
Accounts payable and accrued liabilities	33,002	942
Accounts payable to related party	1,391	285
Other liabilities	(136)	5,337
Net cash used in operating activities	(179,485)	(61,291)
Cash Flows from Investing Activities:
Purchases of property and equipment	(73,425)	(42,576)
Payments to Acquire Businesses, Gross	(6,670)	0
Net cash used in investing activities	(80,095)	(42,576)
Cash Flows from Financing Activities:
Proceeds from floor plan facility	837,673	397,082
Payments on floor plan facility	(739,378)	(395,555)
Proceeds from Verde Credit Facility	0	35,000
Payments on Verde Credit Facility	0	(35,000)
Proceeds from long-term debt	25,670	2,980
Payments on long-term debt	(2,852)	(641)
Payments of debt issuance costs, including $0 and $1,000 to related parties, respectively	(325)	(1,000)
Proceeds from exercise of stock options	169	0
Tax withholdings related to restricted stock awards	(323)	0
Net cash provided by financing activities	290,005	209,189
Net increase in cash, cash equivalents and restricted cash	30,425	105,322
Cash, cash equivalents and restricted cash at beginning of period	187,123	49,450
Cash, cash equivalents and restricted cash at end of period	217,548	154,772
Common Stock
Cash Flows from Financing Activities:
Net proceeds from issuance of Class A common stock	172,287	206,323
Convertible Preferred Stock
Cash Flows from Financing Activities:
Dividends paid on Class A Convertible Preferred Stock	(2,904)	0
Payments of costs related to issuance of Class A Convertible Preferred Stock	$ (12)	$ 0