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Accretion of Debt Issuance Cost and Debt Discount in Connection with Facility Financing Agreement (Detail) - Deerfield - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Debt Instrument [Line Items]    
Accretion expense- debt issuance cost $ 9 $ 9
Accretion expense- debt discount $ 419 $ 364