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Composition of Certain Financial Statement Captions - Accounts Payable and Accrued Expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Accounts Payable and Accrued Expenses [Abstract]    
Accrued expenses $ 791 $ 824
Accounts payable 327 721
Accrued payroll and bonus 679 423
Accrued professional fees 332 186
Accrued vacation and compensation 166 192
Accrued R&D studies 858 230
Finance lease obligation - current 120  
Other current liabilities 6 201
Accounts payable and accrued expenses, Total $ 3,279 $ 2,777