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Composition of Certain Financial Statement Captions - Accounts Payable and Accrued Expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Accounts Payable and Accrued Expenses [Abstract]    
Accrued expenses $ 1,752 $ 2,022
Accounts payable 1,332 1,009
Accrued payroll and bonus 989 1,058
Accrued legal fees 614 372
Accrued vacation 502 573
Accrued R&D studies 347 1,117
Deferred rent 215 221
Accrued accounting fees 121 315
Accounts payable and accrued expenses, Total $ 5,872 $ 6,687