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Commitments - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Loss Contingencies [Line Items] |  |  |  |
Rent expenses |  | $ 3.5 | $ 3.1 | $ 3.0
Inventory purchase commitments with third-party |  | $ 0.1 | $ 1.9 |
Scenario, Forecast [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Increase in net lease liability and assets | $ 8.0 |  |  |

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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717 + Details
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