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Sale of Assets - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 08, 2018
Mar. 01, 2018
Jan. 16, 2018
Jan. 15, 2018
Nov. 01, 2017
Sep. 22, 2017
Jun. 30, 2018
Jun. 30, 2018
Jul. 01, 2017
Dec. 15, 2017
Business Acquisition [Line Items]                    
Proceeds from sale of manufacturing equipment               $ 5,820,000 $ 57,000  
Gain on disposals of assets               2,609,000 $ 57,000  
Cardinal [Member] | Asset Purchase Agreement [Member] | Manufacturing Equipment [Member]                    
Business Acquisition [Line Items]                    
Proceeds from sale of manufacturing equipment $ 14,800,000 $ 15,000,000 $ 10,000,000 $ 10,000,000 $ 3,000,000 $ 28,000,000   27,800,000    
Asset supply agreement term           7 years        
Property, plant and equipment, fair market value             $ 5,800,000 5,800,000   $ 1,900,000
Deferred income           $ 20,300,000        
Payment amortized under supply agreement term           7 years        
Net book value of assets held for sale             3,200,000 3,200,000   $ 1,500,000
Amount received less than specified in APA               200,000    
Cardinal [Member] | Asset Purchase Agreement [Member] | Manufacturing Equipment [Member] | Selling, General and Administrative Expenses [Member]                    
Business Acquisition [Line Items]                    
Gain on disposals of assets             2,600,000      
Cardinal [Member] | Asset Purchase Agreement [Member] | Manufacturing Equipment [Member] | Other Current Assets [Member]                    
Business Acquisition [Line Items]                    
Property, plant and equipment, fair market value           $ 7,700,000        
Net book value of assets held for sale           $ 4,700,000        
Cardinal [Member] | Supply Agreement [Member]                    
Business Acquisition [Line Items]                    
Unamortized balance of deffred gain             18,300,000 18,300,000    
Cardinal [Member] | Supply Agreement [Member] | Inventory Classified as Cost of Sales [Member]                    
Business Acquisition [Line Items]                    
Amortization of deferred gain             702,000 1,400,000    
Cardinal [Member] | Supply Agreement [Member] | Accrued Liabilities [Member]                    
Business Acquisition [Line Items]                    
Unamortized balance of deffred gain             2,800,000 2,800,000    
Cardinal [Member] | Supply Agreement [Member] | Other Liabilities [Member]                    
Business Acquisition [Line Items]                    
Unamortized balance of deffred gain             $ 15,500,000 $ 15,500,000