Nature of the Business and Summary of Significant Accounting Policies - Schedules of Concentration of Risk by Risk Factor - Gross Accounts Receivable (Detail) - Accounts Receivable [Member] - Credit Concentration Risk [Member]	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Baxalta [Member]
Concentration Risk [Line Items]
Customer's accounted for more than 10% percent gross accounts receivable	29.00%	49.00%
Sanofi [Member]
Concentration Risk [Line Items]
Customer's accounted for more than 10% percent gross accounts receivable		50.00%
Amerisource Bergen Corporation [Member]
Concentration Risk [Line Items]
Customer's accounted for more than 10% percent gross accounts receivable	29.00%
Mckesson Corporation [Member]
Concentration Risk [Line Items]
Customer's accounted for more than 10% percent gross accounts receivable	25.00%
Cardinal Health Inc [Member]
Concentration Risk [Line Items]
Customer's accounted for more than 10% percent gross accounts receivable	16.00%