Revised Consolidated Financial Statements Information - Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Current Assets:
Cash and cash equivalents	$ 51,093			$ 135,585				$ 398,915
Restricted cash	47,068			73,234				73,095
Accounts receivable, net of allowance								0
Finance receivables at fair value	487,573			348,670
Finance receivables held for sale, net	363,029			503,546				321,626
Beneficial interests in securitizations								20,592
Prepaid expenses and other current assets								0
Assets, Current, Total								814,228
Finance receivables at fair value				348,670				153,174
Property and equipment, net	3,055			4,982				4,466
Intangible assets, net	111,625			131,892				158,910
Operating lease right-of-use assets	6,805			7,063				2,553
Interest Receivable				14,484				7,242
Other assets	36,446			59,429				46,212
Assets from discontinued operations	3,016			196,537				432,242
Total assets	1,123,734			1,475,422				1,619,027
Current Liabilities:
Accounts payable								0
Accrued expenses								0
Warehouse credit facilities of consolidated VIEs				421,268				229,518
Operating lease liabilities, current								0
Other current liabilities								0
Liabilities, Current, Total								229,518
Long-term debt (including securitization debt of consolidated VIEs of $242.3 million at amortized cost and $167.7 million at fair value as of September 30, 2024 and $314.1 million at fair value as of December 31, 2023)	729,372			626,583				449,393
Operating lease liabilities, excluding current portion				10,459				5,231
Other long-term liabilities				61,321				71,229
Liabilities from discontinued operations	4,997			228,120				383,823
Total liabilities	1,119,051			1,347,751				1,139,194
Commitments and Contingencies
Stockholders' equity:
Common stock, $0.001 par value; 500,000,000 shares authorized as of September 30, 2024 and December 31, 2023; 1,808,243 and 1,791,286 shares issued and outstanding as of September 30, 2024 and December 31, 2023, respectively	2			2				2
Additional paid-in-capital	2,093,941			2,088,381				2,075,931
Accumulated deficit	(2,089,260)			(1,960,712)				(1,596,100)
Total stockholders' equity	4,683	$ 43,142	$ 61,487	127,671	$ 263,574	$ 343,410	$ 407,133	479,833
Total liabilities and stockholders' equity	$ 1,123,734			1,475,422				1,619,027
As Reported
Current Assets:
Cash and cash equivalents				135,585				398,915
Restricted cash				73,234				73,095
Accounts receivable, net of allowance				9,139				13,967
Finance receivables at fair value				12,501				12,939
Finance receivables held for sale, net				503,546				321,626
Inventory				163,250				320,648
Beneficial interests in securitizations				4,485				20,592
Prepaid expenses and other current assets				50,899				58,327
Assets, Current, Total				952,639				1,220,109
Finance receivables at fair value				336,169				140,235
Property and equipment, net				24,132				50,201
Intangible assets, net				131,892				158,910
Operating lease right-of-use assets				7,063				23,568
Other assets				23,527				26,004
Total assets				1,475,422				1,619,027
Current Liabilities:
Accounts payable				26,762				34,702
Accrued expenses				52,452				76,795
Vehicle floorplan				151,178				276,988
Warehouse credit facilities of consolidated VIEs				421,268				229,518
Current portion of long term debt				172,410				47,239
Deferred revenue				14,025				10,655
Operating lease liabilities, current				8,737				9,730
Other current liabilities				9,974				17,693
Liabilities, Current, Total				856,806				703,320
Long-term debt (including securitization debt of consolidated VIEs of $242.3 million at amortized cost and $167.7 million at fair value as of September 30, 2024 and $314.1 million at fair value as of December 31, 2023)				454,173				402,154
Operating lease liabilities, excluding current portion				25,183				20,129
Other long-term liabilities				17,109				18,183
Total liabilities				1,353,271				1,143,786
Commitments and Contingencies
Stockholders' equity:
Common stock, $0.001 par value; 500,000,000 shares authorized as of September 30, 2024 and December 31, 2023; 1,808,243 and 1,791,286 shares issued and outstanding as of September 30, 2024 and December 31, 2023, respectively				2				2
Additional paid-in-capital				2,088,381				2,075,931
Accumulated deficit				(1,966,232)				(1,600,692)
Total stockholders' equity				122,151				475,241
Total liabilities and stockholders' equity				1,475,422				1,619,027
Adjustments
Current Liabilities:
Accounts payable				(4,138)				(3,310)
Other current liabilities				(1,382)				(1,283)
Liabilities, Current, Total				(5,520)				(4,592)
Total liabilities				(5,520)				(4,592)
Commitments and Contingencies
Stockholders' equity:
Accumulated deficit				5,520				4,592
Total stockholders' equity				5,520				4,592
Presentation Reclasses
Current Assets:
Accounts receivable, net of allowance				(4,726)				(921)
Finance receivables at fair value				(12,501)				(12,939)
Beneficial interests in securitizations				(4,485)
Prepaid expenses and other current assets				(42,081)				(29,775)
Assets, Current, Total				(63,793)				(43,635)
Finance receivables at fair value				12,501				12,939
Interest Receivable				14,484				7,242
Other assets				36,808				23,454
Current Liabilities:
Accounts payable				(16,185)				(16,869)
Accrued expenses				(25,319)				(29,733)
Current portion of long term debt				(172,410)				(47,239)
Operating lease liabilities, current				(2,632)				(2,378)
Other current liabilities				(2,708)				(6,444)
Liabilities, Current, Total				(219,254)				(102,663)
Long-term debt (including securitization debt of consolidated VIEs of $242.3 million at amortized cost and $167.7 million at fair value as of September 30, 2024 and $314.1 million at fair value as of December 31, 2023)				172,410				47,239
Operating lease liabilities, excluding current portion				2,632				2,378
Other long-term liabilities				44,212				53,046
Commitments and Contingencies
Discontinued Operations
Current Assets:
Accounts receivable, net of allowance				4,413				13,046
Inventory				163,250				320,648
Prepaid expenses and other current assets				8,818				28,552
Assets, Current, Total				176,481				362,246
Property and equipment, net				19,150				45,735
Operating lease right-of-use assets								21,015
Other assets				906				3,246
Assets from discontinued operations				196,537				432,242
Current Liabilities:
Accounts payable				6,439				14,523
Accrued expenses				27,133				47,062
Vehicle floorplan				151,178				276,988
Deferred revenue				14,025				10,655
Operating lease liabilities, current				6,105				7,352
Other current liabilities				5,884				9,966
Liabilities, Current, Total				210,764				366,547
Operating lease liabilities, excluding current portion				17,356				17,276
Liabilities from discontinued operations				228,120				383,823
Commitments and Contingencies