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Capitalized Software Costs - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Acquired Finite-Lived Intangible Assets [Line Items]        
Impairment losses     $ 1,712 $ 630
Software and Software Development Costs        
Acquired Finite-Lived Intangible Assets [Line Items]        
Capitalized software costs, additions $ 32 $ 89 90 248
Amortization 160 145 480 475
Impairment losses $ 232 $ 0 $ 232 $ 25
Minimum | Software and Software Development Costs        
Acquired Finite-Lived Intangible Assets [Line Items]        
Capitalized software costs, useful life     3 years  
Maximum | Software and Software Development Costs        
Acquired Finite-Lived Intangible Assets [Line Items]        
Capitalized software costs, useful life     4 years