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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 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Debt Instrument [Line Items]        
Accretion expense - debt issuance cost $ 7 $ 9 $ 39 $ 26
Accretion expense - debt discount $ 431 $ 428 $ 1,564 $ 1,280