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Deferred Commissions (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Capitalized Contract Cost [Line Items] |  |  |
Deferred commissions |  | $ 21.9 | $ 19.3
Deferred commissions amortization |  | $ 15.6 | $ 11.2
Minimum |  |  |
Capitalized Contract Cost [Line Items] |  |  |
Sales commissions amortization period (in years) | 3 years | 3 years | 1 year
Maximum |  |  |
Capitalized Contract Cost [Line Items] |  |  |
Sales commissions amortization period (in years) | 7 years | 7 years | 2 years

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