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Acquisition of Spectrum LifeSciences, LLC - Additional Information (Detail) - USD ($)
3 Months Ended 12 Months Ended
Aug. 01, 2017
Mar. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]      
Finite lived intangible asset, useful life   16 years 16 years
Goodwill   $ 327,989,000 $ 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 265,654,000    
Goodwill expected to be deductible for tax purposes amount 0    
Business acquisition, revenue   $ 11,719,000  
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 related costs   $ 655,000 $ 7,060,000