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Significant Accounting Policies - Additional Information (Details) |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 07, 2019 USD ($) $ / shares shares | May 24, 2019 | Mar. 15, 2018 shares | Jun. 30, 2019 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jun. 06, 2019 USD ($) | Jan. 01, 2019 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net proceeds from issuance of initial public offering |  |  |  |  |  |  | $ 57,077,000 |  |  |  |
Offering costs |  |  |  |  | $ 500,000 | $ 500,000 | 1,834,000 | $ 2,521,000 |  |  |
Stock repurchased during period, value |  |  |  |  |  |  | 40,816,000 |  |  |  |
Deferred offering costs |  |  |  |  |  |  |  | 2,521,000 |  | $ 3,800,000 |
Revenue recognized |  |  |  |  |  |  | 600,993,000 | 498,739,000 | $ 399,597,000 |  |
Selling and distribution |  |  |  |  |  |  | 87,706,000 | 70,621,000 | 50,766,000 |  |
Allowances for doubtful accounts |  |  |  |  | 100,000 |  | 100,000 | 200,000 |  |  |
Impairment losses |  |  |  |  |  |  | 0 | 0 | 0 |  |
Goodwill |  |  |  |  | 2,042,000 |  | 2,042,000 | 2,042,000 |  |  |
Goodwill impairment |  |  |  |  |  |  | $ 0 | 0 | 0 |  |
Minimum percentage of likelihood of realization of deferred tax assets and liabilities |  |  |  |  |  |  | 50.00% |  |  |  |
Cash equivalents |  |  |  |  | 37,600,000 |  | $ 37,600,000 | 0 |  |  |
Emerging growth company description |  |  |  |  |  |  | We will remain an emerging growth company until the earliest of (1) the end of the fiscal year in which the market value of our common stock that is held by non-affiliates is at least $700 million as of the last business day of our most recently completed second fiscal quarter, (2) the end of the fiscal year in which we have total annual gross revenues of $1.07 billion or more during such fiscal year, (3) the date on which we issue more than $1.0 billion in non-convertible debt in a three-year period, or (4) the end of the fiscal year in which the fifth anniversary of our IPO occurs. |  |  |  |
Net increase in retained earnings |  |  |  |  | 56,677,000 |  | $ 56,677,000 | 61,270,000 |  |  |
TSG |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Related party transaction, management fees |  |  |  |  |  |  | 500,000 | 300,000 | 300,000 |  |
Related party amount owed |  |  |  |  | 0 |  | $ 0 | 0 |  |  |
Equipment and Fixtures, and Leasehold Improvements |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  |  |  | shorter, the remaining lease term for leasehold improvements |  |  |  |
Capitalized Software |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  |  |  | 3 years |  |  |  |
Minimum | Equipment and Fixtures, and Leasehold Improvements |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  |  |  | 3 years |  |  |  |
Maximum | Equipment and Fixtures, and Leasehold Improvements |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  |  |  | 5 years |  |  |  |
Shipping and Handling Costs |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Selling and distribution |  |  |  |  |  |  | $ 57,000,000 | $ 47,100,000 | $ 31,100,000 |  |
Topic 606 | Impact Due to ASC 606 |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recognized |  |  |  |  |  |  | (2,389,000) |  |  |  |
Selling and distribution |  |  |  |  |  |  | 123,000 |  |  |  |
Net increase in retained earnings |  |  |  |  | $ (2,552,000) |  | (2,552,000) |  |  |  | $ 300,000
Topic 606 | Breakage on Store Credit and Gift Cards |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recognized |  |  |  |  |  |  | $ 2,400,000 |  |  |  |
IPO |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares issued | shares | 2,941,176 |  |  |  |  |  |  |  |  |  |
Shares issued, price per share | $ / shares | $ 18.00 |  |  |  |  |  |  |  |  |  |
Net proceeds from issuance of initial public offering | $ 45,800,000 |  |  |  |  |  |  |  |  |  |
Underwriting discounts | 3,300,000 |  |  |  |  |  |  |  |  |  |
Offering costs | 3,800,000 |  |  |  |  |  |  |  |  |  |
Class T and Class A Unit |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Conversion of stock, shares issued | shares |  |  |  |  |  |  | 65,488,053 |  |  |  |
Reverse split, ratio |  | 0.045 |  |  |  |  |  |  |  |  |
Class B Common Stock |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Conversion of stock, shares issued | shares |  |  |  | 10,147,059 |  |  | 67,889,013 |  |  |  |
Stock repurchased during period, value | $ 40,800,000 |  |  |  |  |  | $ 40,800,000 |  |  |  |
Stock repurchased during period, shares | shares | 2,400,960 |  |  |  |  |  |  |  |  |  |
Preferred Class T Unit |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Conversion of stock, shares issued | shares |  |  | 1,309,761 |  |  |  | 2,400,960 |  |  |  |
Class A Common Stock |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Conversion of stock, shares issued | shares |  |  |  |  |  |  | 1 |  |  |  |
Shares issued | shares |  |  |  | 441,176 |  |  |  |  |  |  |
Shares issued, price per share | $ / shares |  |  |  | $ 18.00 |  |  |  |  |  |  |
Underwriting discounts |  |  |  | $ 500,000 |  |  |  |  |  |  |
Proceeds from issuance of stock |  |  |  | $ 7,500,000 |  |  |  |  |  |  |

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