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Significant Accounting Policies - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Accounting Policies and General Information [Line Items]          
Advertising expenses $ 357 $ 311 $ 1,097 $ 1,099  
Deferred offering costs         5,156
Accrued offering costs 7,039   7,039   6,930
IPO [Member]
          
Accounting Policies and General Information [Line Items]          
Total offering costs charged against equity 8,700   8,700    
Secondary Public Offering [Member]
          
Accounting Policies and General Information [Line Items]          
Deferred offering costs         0
Total offering costs charged against equity 126   126    
Secondary Public Offering [Member] | Selling Stockholder [Member]
          
Accounting Policies and General Information [Line Items]          
Accrued offering costs $ 56   $ 56