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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($)
 12 Months Ended
Apr. 01, 2019
Dec. 31, 2020
Dec. 31, 2019
Jan. 01, 2019
Summary Of Significant Accounting Policies [Line Items]        
Accounts receivable   $ 8,889,000 $ 10,622,000  
Allowance for doubtful accounts   1,200,000 200,000  
Bad debt expense (recovery)   1,100,000 (100,000)  
Earned revenue accrued but not billed   0 0  
Property and equipment impairment   100,000    
Impairment charges on indefinite-lived intangible assets   0    
Impairment charges on finite-lived intangible assets     0  
Restricted cash   1,100,000 1,100,000  
Investment without readily determinable fair value   100,000 100,000  
Advertising cost during the period   900,000 900,000  
Operating lease right-of-use assets   8,668,000 9,250,000  
Operating lease obligation   10,570,000    
Unrecognized Tax Benefits   0 0  
COVID19        
Summary Of Significant Accounting Policies [Line Items]        
Accounts receivable   1,200,000    
Allowance for doubtful accounts   1,000,000    
Bad debt expense (recovery)   1,000,000    
Promissory Note Receivable [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Gross financing receivable $ 900,000      
Maturity date of promissory note receivable Apr. 01, 2019      
Effective yield on receivable with imputed interest (interest rate) 5.10%      
Promissory note receivable     0  
Trademarks        
Summary Of Significant Accounting Policies [Line Items]        
Impairment charges on indefinite-lived intangible assets     6,200,000  
Impairment charges on finite-lived intangible assets   $ 13,000,000    
Minimum        
Summary Of Significant Accounting Policies [Line Items]        
Estimated useful lives of property and equipment (in years)   3 years    
Estimated useful life of finite-lived intangible asset (in years)   7 years    
Maximum        
Summary Of Significant Accounting Policies [Line Items]        
Estimated useful lives of property and equipment (in years)   7 years    
Estimated useful life of finite-lived intangible asset (in years)   18 years    
Irrevocable Letter Of Credit [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Restricted cash   $ 1,100,000 $ 1,100,000  
Restatement Adjustment [Member] | Accounting Standards Update 2016-02        
Summary Of Significant Accounting Policies [Line Items]        
Operating lease right-of-use assets       $ 10,400,000
Operating lease obligation       13,200,000
Accrued rent offset to Operating lease right-of-use assets       $ 2,800,000