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Capitalized Software Costs - Narrative (Details) - Software and Software Development Costs - USD ($)
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Acquired Finite-Lived Intangible Assets [Line Items]    
Property, plant and equipment, additions $ 34,000 $ 62,000
Amortization 157,000 179,000
Other asset impairment charges $ 0 $ 0
Minimum    
Acquired Finite-Lived Intangible Assets [Line Items]    
Property, plant and equipment, useful life 3 years  
Maximum    
Acquired Finite-Lived Intangible Assets [Line Items]    
Property, plant and equipment, useful life 4 years