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Business Segment Information - Presentation of Total Revenues and Long-Lived Assets by Geographic Area (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Segment Reporting, Revenue Reconciling Item [Line Items]          
Revenues $ 29,861 $ 27,845 $ 87,337 $ 77,783  
Long-lived assets 17,800   17,800   $ 17,934
United States [Member]          
Segment Reporting, Revenue Reconciling Item [Line Items]          
Revenues 24,207 22,469 69,695 58,987  
Long-lived assets 15,866   15,866   16,570
Europe [Member]          
Segment Reporting, Revenue Reconciling Item [Line Items]          
Revenues 2,738 3,252 10,051 10,935  
Other Regions [Member]          
Segment Reporting, Revenue Reconciling Item [Line Items]          
Revenues 2,916 $ 2,124 7,591 $ 7,861  
Long-lived assets 11   11   11
Canada [Member]          
Segment Reporting, Revenue Reconciling Item [Line Items]          
Long-lived assets $ 1,923   $ 1,923   $ 1,353