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Composition of Certain Financial Statement Captions - Accounts Payable and Accrued Expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Accounts Payable and Accrued Expenses [Abstract]    
Accrued expenses $ 1,599 $ 1,752
Accounts payable 1,297 1,332
Accrued payroll and bonus 810 989
Accrued legal fees 509 614
Accrued vacation 64 502
Accrued R&D studies 286 347
Other current liabilities 225 336
Accounts payable and accrued expenses, Total $ 4,790 $ 5,872