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Acquisition of Spectrum LifeSciences, LLC - Additional Information (Detail) - USD ($) |  | 3 Months Ended | 5 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Aug. 01, 2017 | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2018 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |  |  |
Finite lived intangible asset, useful life |  |  |  | 16 years | 16 years
Goodwill |  | $ 326,977,000 | $ 327,333,000 | $ 326,977,000 | $ 327,333,000
Customer relationships |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Finite lived intangible asset, useful life |  |  |  | 14 years | 14 years
Technology - developed |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Finite lived intangible asset, useful life |  |  |  | 19 years | 19 years
Spectrum Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash payment to acquire business | $ 122,932,000 |  |  |  |
Shares issued for business acquisition | 6,153,995 |  |  |  |
Value of common stock issued | $ 247,575,000 |  |  |  |
Working capital adjustment | 425,000 |  |  |  |
Purchase price business acquisition | 370,932,000 |  |  |  |
Fair value of net assets acquired | 370,932,000 |  |  |  |
Goodwill | 265,722,000 |  |  |  |
Goodwill expected to be deductible for tax purposes amount | 0 |  |  |  |
Business acquisition, revenue |  | $ 13,188,000 | $ 19,394,000 | $ 37,220,000 |
Spectrum Inc. | Customer relationships |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Fair value of acquired finite lived intangible assets | $ 78,400,000 |  |  |  |
Finite lived intangible asset, useful life | 15 years |  |  |  |
Spectrum Inc. | Technology - developed |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Fair value of acquired finite lived intangible assets | $ 38,560,000 |  |  |  |
Finite lived intangible asset, useful life | 20 years |  |  |  |
Spectrum Inc. | Non-competition agreements |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Fair value of acquired finite lived intangible assets | $ 960,000 |  |  |  |
Finite lived intangible asset, useful life | 3 years |  |  |  |
Spectrum Inc. | Trademark and Tradename |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Fair value of acquired finite lived intangible assets | $ 2,160,000 |  |  |  |
Spectrum Inc. | Selling, general and administrative |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business combination, acquisition and integration related costs |  |  |  | $ 2,313,000 | $ 7,060,000

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