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Domestic and Foreign Operations (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues $ 20,752 $ 17,582
U.S. [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues 17,609 14,430
Canada [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues 845 1,002
Other International [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues $ 2,298 $ 2,150