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Accrued Expenses and Other Current Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Payables and Accruals [Abstract]    
Clinical trial costs $ 5,601 $ 3,109
Zuplenz milestone payments 3,222 0
Credit memos for expiring Zuplenz channel inventory 1,384 0
Patient assistance programs and rebates 1,969 2,618
Compensation and related benefits 1,946 1,999
Professional fees 919 713
Royalties 188 158
Interest expense 63 70
Accrued expenses and other current liabilities $ 15,292 $ 8,667