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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 |

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