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Summary of Significant Accounting Policies - Additional Information (Details) |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 30, 2023 USD ($) | Jan. 31, 2023 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2023 USD ($) | Jun. 30, 2022 USD ($) | Jun. 30, 2023 USD ($) Facility | Jun. 30, 2022 USD ($) | Dec. 31, 2022 USD ($) | Nov. 30, 2022 USD ($)
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Other comprehensive income (loss) |  |  |  | $ 0 | $ 0 | $ 0 | $ 0 |  |
Valuation allowance for finance receivables classified as held for sale |  |  |  | 10,200,000 |  | 10,200,000 |  | $ 10,500,000 |
Debt instrument aggregate principal amount |  |  |  | 422,580,000 |  | 422,580,000 |  | 82,556,000 |
Repurchases of convertible senior notes |  |  |  |  |  | 13,194,000 |  |  |
Cash and cash equivalents |  |  |  | 237,925,000 |  | 237,925,000 |  | 398,915,000 |
Restricted Cash |  |  |  | 66,300,000 |  | 66,300,000 |  |  |
Gain on debt extinguishment |  |  |  | $ 10,931,000 |  | $ 19,640,000 |  |  |
Business combination, measurement period |  |  |  |  |  | 1 year |  |  |
ASU 2021-08 |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Change in accounting principle, accounting standards update, adopted [true false] |  |  |  | true |  | true |  |  |
Change in accounting principle, accounting standards update, adoption date |  |  |  | Jan. 01, 2023 |  | Jan. 01, 2023 |  |  |
Change in accounting principle, accounting standards update, immaterial effect [true false] |  |  |  | true |  | true |  |  |
0.75% Unsecured Convertible Senior Notes Due 2026 |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument aggregate principal amount |  |  | $ 625,000,000.0 |  |  |  |  |  |
Aggregate principal amount |  |  |  | $ 18,200,000 |  | $ 32,800,000 |  |  |
Repurchases of convertible senior notes |  |  |  | 7,300,000 |  | 13,200,000 |  |  |
Gain on debt extinguishment |  |  |  | 10,900,000 |  | 19,600,000 |  |  |
Debt instrument interest rate |  |  | 0.75% |  |  |  |  |  |
Debt instrument maturity year |  |  | 2026 |  |  |  |  |  |
Unamortized debt discount and debt issuance costs |  |  |  | 5,100,000 |  | 5,100,000 |  |  |
Net carrying value of debt |  |  |  | 327,400,000 |  | 327,400,000 |  |  |
Warehouse Credit Facility |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Increased borrowing capacity |  |  |  | 93,000,000.0 |  | 93,000,000.0 |  | $ 105,800,000 |
Selling, General and Administrative Expenses |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Advertising expense |  |  |  | 15,000,000.0 | 21,100,000 | 26,400,000 | 54,900,000 |  |
Selling, General and Administrative Expenses | Shipping and Handling |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Shipping and handling expenses |  |  |  | 2,000,000.0 | $ 8,200,000 | $ 4,000,000.0 | $ 35,000,000.0 |  |
UACC |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Net proceeds from securitization | $ 23,100,000 | $ 237,800,000 |  |  |  |  |  |  |
Number of warehouse credit facilities | Facility |  |  |  |  |  | 4 |  |  |
UACC | Warehouse Credit Facility |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Aggregate borrowing limit |  |  |  | 850,000,000.0 |  | $ 850,000,000.0 |  |  |
Increased borrowing capacity |  |  |  | 93,000,000.0 |  | 93,000,000.0 |  |  |
Outstanding borrowings |  |  |  | 177,900,000 |  | 177,900,000 |  |  |
Asset-backed Securities | UACC |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Securitization transaction |  | $ 238,700,000 |  |  |  |  |  |  |
Vehicle Floorplan Facility | Line Of Credit |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Increased borrowing capacity |  |  |  | 171,600,000 |  | 171,600,000 |  |  |
2022 Vehicle Floorplan Facility | Line Of Credit |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Increased borrowing capacity |  |  |  |  |  |  |  |  | $ 500,000,000.0
Line of credit facility, unutilized borrowing capacity |  |  |  | $ 39,100 |  | $ 39,100 |  |  |

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