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Significant Accounting Policies - Additional Information (Detail)
 3 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
Customer
Dec. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
Customer
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Jan. 01, 2019
USD ($)
Jan. 01, 2018
USD ($)
Revenue, Major Customer [Line Items]              
Gross deferred revenue $ 3,820,000 $ 5,015,000 $ 3,820,000 $ 5,015,000      
Gross deferred cost of revenue   2,135,000   2,135,000      
Foreign currency gains (losses)     $ (260,000) 323,000 $ (268,000)    
Maturity period of cash and cash equivalents     Less than three months        
Available-for-sale securities, failed auction, value $ 3,000,000   $ 3,000,000        
Number of customers accounted for trade account receivable | Customer 1   1        
Cost of advertising     $ 2,610,000 2,150,000 $ 1,818,000    
Percentage likelihood of tax benefit settlement     50.00%        
Retained Earnings (Accumulated Deficit) $ 129,000,000 93,605,000 $ 129,000,000 $ 93,605,000      
Finance Lease, Liability           $ 4,500,000  
Accounting Standards Update 2014-09 [Member]              
Revenue, Major Customer [Line Items]              
Gross deferred revenue (1,195,000)   (1,195,000)        
Deferred revenue current     991,000        
Accounting Standards Update 2014-09 [Member] | Adjustments [Member]              
Revenue, Major Customer [Line Items]              
Retained Earnings (Accumulated Deficit) (5,408,000)   $ (5,408,000)       $ 3,670,000
Increase in revenue $ 14,949 $ 14,949          
Customer One [Member]              
Revenue, Major Customer [Line Items]              
Percentage of trade account receivable     14.30% 17.50%      
Maximum [Member]              
Revenue, Major Customer [Line Items]              
Estimated useful life of intangible assets     20 years        
Customer Payments Period     60 days        
Minimum [Member]              
Revenue, Major Customer [Line Items]              
Customer Payments Period     30 days