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Business Segment Information - Presentation of Total Revenues and Long-Lived Assets by Geographic Area (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Segment Reporting, Revenue Reconciling Item [Line Items]          
Revenues $ 26,401 $ 24,337 $ 49,938 $ 45,501  
Long-lived assets 18,471   18,471   17,933
United States [Member]
         
Segment Reporting, Revenue Reconciling Item [Line Items]          
Revenues 19,113 18,959 36,518 34,999  
Long-lived assets 17,205   17,205   16,925
Europe [Member]
         
Segment Reporting, Revenue Reconciling Item [Line Items]          
Revenues 3,681 2,438 7,682 5,284  
Other Regions [Member]
         
Segment Reporting, Revenue Reconciling Item [Line Items]          
Revenues 3,607 2,940 5,738 5,218  
Long-lived assets 22   22   33
Canada [Member]
         
Segment Reporting, Revenue Reconciling Item [Line Items]          
Long-lived assets $ 1,244   $ 1,244   $ 975