Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2016
USD ($)
lease
Dec. 31, 2016
USD ($)
lease
unit
Dec. 31, 2016
USD ($)
lease
Dec. 31, 2016
USD ($)
lease
segment
Dec. 31, 2016
USD ($)
lease
Dec. 31, 2016
USD ($)
lease
Segment
Dec. 31, 2015
USD ($)
Jan. 01, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
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Jan. 01, 2017
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Dec. 31, 2014
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Summary of Significant Accounting Policies [Line Items]                        
Number of reporting units | unit   1                    
Number of operating segments       1   1            
Impairment charges         $ 20,899,000   $ 788,000          
Unrecognized tax benefit $ 0 $ 0 $ 0 $ 0 0 $ 0 0         $ 0
Interest or penalties accrued 0 0 0 0 0 0           $ 0
Capitalized cost of software and website development 2,400,000 2,400,000 2,400,000 2,400,000 2,400,000 2,400,000 1,700,000          
Impairment charge related to capitalized internally developed software and website applications         800,000              
Royalty assets 500,000 500,000 500,000 500,000 500,000 500,000 300,000          
Minimum guaranteed liability $ 400,000 $ 400,000 $ 400,000 $ 400,000 400,000 $ 400,000 200,000          
Royalty payments         6,200,000   7,000,000          
Restructuring costs         2,103,000   1,311,000          
Advertising expenses totaled         $ 8,900,000   $ 8,600,000          
Number of operating leases | lease 1 1 1 1 1 1            
Forecast [Member]                        
Summary of Significant Accounting Policies [Line Items]                        
Minimum guaranteed liability                 $ 100,000 $ 400,000    
Accounting Standards Update 2016-09 [Member] | Additional paid-in capital [Member] | Subsequent Event [Member]                        
Summary of Significant Accounting Policies [Line Items]                        
Cumulative effect of new accounting principle                     $ 200,000  
Accounting Standards Update 2016-02 [Member] | Forecast [Member]                        
Summary of Significant Accounting Policies [Line Items]                        
Operating lease right of use asset               $ 1,900,000        
Lease liability               $ 1,900,000        
Customer Concentration Risk [Member] | Accounts receivable [Member] | Top Two Customers [Member]                        
Summary of Significant Accounting Policies [Line Items]                        
Concentration risk percentage (as percent)             31.00%          
Customer Concentration Risk [Member] | Accounts receivable [Member] | Customer one [Member]                        
Summary of Significant Accounting Policies [Line Items]                        
Concentration risk percentage (as percent)             18.00%          
Customer Concentration Risk [Member] | Accounts receivable [Member] | Customer two [Member]                        
Summary of Significant Accounting Policies [Line Items]                        
Concentration risk percentage (as percent)             13.00%          
Supplier Concentration Risk [Member] | Accounts payable [Member] | Top Two Suppliers [Member]                        
Summary of Significant Accounting Policies [Line Items]                        
Concentration risk percentage (as percent)     29.00%                  
Supplier Concentration Risk [Member] | Accounts payable [Member] | Supplier One [Member]                        
Summary of Significant Accounting Policies [Line Items]                        
Concentration risk percentage (as percent)     16.00%                  
Supplier Concentration Risk [Member] | Accounts payable [Member] | Supplier Two [Member]                        
Summary of Significant Accounting Policies [Line Items]                        
Concentration risk percentage (as percent)     13.00%                  
Computer software [Member]                        
Summary of Significant Accounting Policies [Line Items]                        
Estimated useful life 2 years