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Accretion of Debt Issuance Cost and Debt Discount in Connection with Deerfield Financing (Detail) - Deerfield - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Debt Instrument [Line Items]        
Accretion expense- debt issuance cost $ 9 $ 9 $ 26 $ 318
Accretion expense - debt discount $ 397 $ 306 $ 1,142 $ 7,189