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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 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Debt Instrument [Line Items]        
Accretion expense- debt issuance cost $ 9 $ 9 $ 17 $ 17
Accretion expense- debt discount $ 433 $ 380 $ 852 $ 745