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Summary of Significant Accounting Policies - Schedule of Customer and Product Concentration Risk (Detail)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Company A [Member]      
Concentration Risk [Line Items]      
Concentration risk percentage 5.80% 16.50%  
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Company B [Member]      
Concentration Risk [Line Items]      
Concentration risk percentage 12.90% 13.40%  
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Company C [Member]      
Concentration Risk [Line Items]      
Concentration risk percentage 10.30% 9.80%  
Revenues [Member] | Customer Concentration Risk [Member]      
Concentration Risk [Line Items]      
Concentration risk percentage 12.00% 11.00% 10.00%
Revenues [Member] | Customer Concentration Risk [Member] | Company A [Member]      
Concentration Risk [Line Items]      
Concentration risk percentage 11.30% 18.00% 18.80%
Revenues [Member] | Customer Concentration Risk [Member] | Company B [Member]      
Concentration Risk [Line Items]      
Concentration risk percentage 11.90% 11.10% 10.20%
Revenues [Member] | Customer Concentration Risk [Member] | Company C [Member]      
Concentration Risk [Line Items]      
Concentration risk percentage 9.70% 8.80% 9.80%
Net Product Revenue [Member] | Product Concentration Risk [Member] | D E F I N I T Y [Member]      
Concentration Risk [Line Items]      
Concentration risk percentage 38.10% 31.80% 27.50%
Net Product Revenue [Member] | Product Concentration Risk [Member] | Techne Lite [Member]      
Concentration Risk [Line Items]      
Concentration risk percentage 24.70% 31.00% 32.50%
Net Product Revenue [Member] | Product Concentration Risk [Member] | Xenon [Member]      
Concentration Risk [Line Items]      
Concentration risk percentage 16.70% 12.10% 11.30%