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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