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Summary of Significant Accounting Policies - Additional Information (Detail) $ in Millions |  |  |  | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Apr. 10, 2018 | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Stockholders' Equity, Reverse Stock Split | 0.5 |  |  |  |  |  |  |  |
Accumulated deficit |  | $ (348.2) | $ (318.5) | $ (419.1) |  | $ (348.2) | $ (318.5) |  |
Allowance for Doubtful Accounts |  | 1.3 | 1.8 |  |  | 1.3 | 1.8 | $ 1.1 | $ 1.1
Reserve for sale |  | 4.7 | 4.1 |  |  | 4.7 | 4.1 |  |
Interest on property plant and equipment |  |  |  |  |  | 0.6 | 0.4 |  |
Net of accumulated amortization |  | 56.4 | 46.5 |  |  |  |  |  |
Amortization of software |  |  |  | $ 14.0 | $ 13.9 | 18.5 | 18.4 | 18.7 |
Research and Development Expense |  |  |  |  |  | 19.0 | 13.0 | 11.2 |
Advertising Expense |  |  |  |  |  | 5.6 | 5.9 | 5.4 |
Restatement Adjustment [Member] |  |  |  |  |  |  |  |  |
Non cash income tax expense |  |  |  |  |  | $ 12.7 |  |  |
Accumulated deficit and other liabilities |  |  | 12.7 |  |  |  | 12.7 |  |
Accumulated deficit |  |  | (12.7) |  |  |  | $ (12.7) | (12.7) | $ (12.7)
Computer Software, Intangible Asset [Member] |  |  |  |  |  |  |  |  |
Amortization of software |  | $ 23.6 | $ 20.9 |  |  |  |  | $ 19.4 |

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