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Composition of Certain Financial Statement Captions - Accounts Payable and Accrued Expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Accounts Payable and Accrued Expenses [Abstract]    
Accrued expenses $ 1,191 $ 1,599
Accounts payable 720 1,297
Accrued payroll and bonus 554 810
Accrued legal fees 186 509
Accrued vacation 192 64
Accrued R&D studies 230 286
Other current liabilities 284 225
Accounts payable and accrued expenses, Total $ 3,357 $ 4,790