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Summary of Significant Accounting Policies - Additional Information (Details) |  |  | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 15, 2020 USD ($) $ / shares shares | May 15, 2020 $ / shares shares | Oct. 31, 2020 | Dec. 31, 2020 USD ($) ReportableSegment | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Mar. 31, 2020 USD ($) | Jan. 01, 2020 USD ($) | Jan. 01, 2018 USD ($)
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Cash deposits included in restricted cash |  |  |  | $ 33,826,000 | $ 1,853,000 |  |  |  |
Number of reporting units | ReportableSegment |  |  |  | 3 |  |  |  |  |
Goodwill impairment |  |  |  | $ 0 | 0 | $ 0 |  |  |
Deferred offering costs | $ 1,500,000 |  |  |  |  |  |  |  |
Common stock, issued | shares | 10,800,000 |  |  |  |  |  |  |  |
Sale of stock, price per share | $ / shares | $ 54.50 |  |  |  |  |  |  |  |
Accumulated deficit |  |  |  | (777,871,000) | (573,860,000) |  |  |  |
Operating lease liabilities |  |  |  | 18,145,000 |  |  |  | $ 18,400,000 |
Operating lease right-of-use assets |  |  |  | $ 17,137,000 |  |  |  | $ 17,400,000 |
Topic 606 |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Change in accounting principle, accounting standards update, adopted [true false] |  |  |  | true |  |  |  |  |
Change in accounting principle, accounting standards update, adoption date |  |  |  | Jan. 01, 2018 |  |  |  |  |
ASU 2018-15 |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Change in accounting principle, accounting standards update, adopted [true false] |  |  |  | true |  |  |  |  |
Change in accounting principle, accounting standards update, adoption date |  |  |  | Jan. 01, 2019 |  |  |  |  |
Change in accounting principle, accounting standards update, immaterial effect [true false] |  |  |  | false |  |  |  |  |
Capitalized implementation costs |  |  |  |  | 2,700,000 |  |  |  |
Amortization expenses |  |  |  |  | $ 300,000 |  |  |  |
Topic 842 |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Change in accounting principle, accounting standards update, adopted [true false] |  |  |  | true |  |  |  |  |
Change in accounting principle, accounting standards update, adoption date |  |  |  | Jan. 01, 2020 |  |  |  |  |
Change in accounting principle, accounting standards update, immaterial effect [true false] |  |  |  | false |  |  |  |  |
ASU 2018-13 |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Change in accounting principle, accounting standards update, adopted [true false] |  |  |  | true |  |  |  |  |
Change in accounting principle, accounting standards update, adoption date |  |  |  | Jan. 01, 2020 |  |  |  |  |
Change in accounting principle, accounting standards update, immaterial effect [true false] |  |  |  | true |  |  |  |  |
ASU 2016-13 |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Change in accounting principle, accounting standards update, adopted [true false] |  |  |  | true |  |  |  |  |
Change in accounting principle, accounting standards update, adoption date |  |  |  | Jan. 01, 2020 |  |  |  |  |
Change in accounting principle, accounting standards update, immaterial effect [true false] |  |  |  | true |  |  |  |  |
Cumulative Effect, Period of Adoption, Adjustment | Topic 606 |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Accumulated deficit |  |  |  |  |  |  |  |  | $ 1,700,000
Maximum | ASU 2018-15 |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Amortization term |  |  |  |  | 5 years |  |  |  |
Minimum [Member] | ASU 2018-15 |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Amortization term |  |  |  |  | 2 years |  |  |  |
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 |  |  |  |  |  |  |
Selling, General and Administrative Expenses |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Advertising expense |  |  |  | $ 62,400,000 | $ 49,900,000 | 25,600,000 |  |  |
Selling, General and Administrative Expenses | Shipping and Handling |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Shipping and handling expenses |  |  |  | 30,300,000 | 14,000,000 | $ 6,400,000 |  |  |
Other Assets |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Deferred offering costs |  |  |  | 0 | $ 2,400,000 |  |  |  |
Vehicle Floorplan Facilities | Line Of Credit |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Increased borrowing capacity |  |  |  |  |  |  | $ 450,000,000 |  |
Amended to extend maturity date |  |  | 2022-09 |  |  |  |  |  |
Vehicle Floorplan Facilities | Cash Deposits |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Cash deposits included in restricted cash |  |  |  | $ 31,600,000 |  |  |  |  |

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