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Internal-Use Software Development Costs - Capitalized Computer Software Future Amortization Expense (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
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Research and Development [Abstract] |  |
2017 | $ 2,409 |
2018 | 8,431 |
2019 | 5,153 |
2020 | 1,327 |
Internal use software development costs, net | $ 17,320 | $ 15,539

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