Summary of Significant Accounting Policies - Additional Information (Details)			1 Months Ended	3 Months Ended
	Feb. 28, 2022 USD ($)	May 15, 2020 $ / shares shares	Jun. 30, 2021 USD ($)	Mar. 31, 2022 USD ($) Segment Facility	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($)
Accounting Policies [Line Items]
Other comprehensive income (loss)				$ 0	$ 0
Cash deposits included in restricted cash				196,809,000		$ 82,450,000
Interest income				3,952,000	2,296,000
Interest expense				$ 9,380,000	3,812,000
Number of reporting units | Segment				4
Valuation allowance for finance receivables classified as held for sale				$ 0
Debt instrument aggregate principal amount				206,991,000
RA Agreement
Accounting Policies [Line Items]
Common stock, issued | shares		183,870
Term for issuance of additional shares of common stock		4 years
Sale of stock, price per share | $ / shares		$ 11.57
RA Agreement | Maximum
Accounting Policies [Line Items]
Issuance of additional shares of common stock | shares		8,641,914
0.75% Unsecured Convertible Senior Notes Due 2026
Accounting Policies [Line Items]
Debt instrument aggregate principal amount			$ 625,000,000.0
Debt instrument interest rate			0.75%
Debt instrument maturity year			2026
Selling, General and Administrative Expenses
Accounting Policies [Line Items]
Advertising expense				33,700,000	29,600,000
Selling, General and Administrative Expenses | Shipping and Handling
Accounting Policies [Line Items]
Shipping and handling expenses				26,700,000	$ 15,400,000
Other Loss (Income), Net
Accounting Policies [Line Items]
Other net losses due to changes in fair value				12,000,000.0
Finance [Member]
Accounting Policies [Line Items]
Interest income				10,900,000
Interest expense				800,000
UACC
Accounting Policies [Line Items]
Net proceeds from securitization	$ 317,300,000
Percentage of notes and residual certificates sold	5.00%
Collateralized finance receivable				318,500,000
Carrying value of finance receivables				287,700,000
Asset-backed Securities | UACC
Accounting Policies [Line Items]
Securitization transaction	$ 281,400,000
Residual Interest, 2022-1 Securitization | UACC
Accounting Policies [Line Items]
Securitization transaction	$ 32,300,000
Vehicle Floorplan Facilities | Line Of Credit
Accounting Policies [Line Items]
Increased borrowing capacity						$ 700,000,000.0
Lenders | Cash Deposits
Accounting Policies [Line Items]
Cash deposits included in restricted cash				$ 113,700,000
Diverse Bank Group | UACC
Accounting Policies [Line Items]
Number of warehouse credit facilities | Facility				3
Diverse Bank Group | UACC | Warehouse Credit Facility
Accounting Policies [Line Items]
Increased borrowing capacity				$ 350,000,000.0