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Accrued Expenses and Other Current Liabilities (Tables)
12 Months Ended
Dec. 31, 2019
Payables and Accruals [Abstract]  
Schedule of Accrued Expenses and Other Current Liabilities

Accrued expenses and other current liabilities at December 31, 2019 and 2018 are summarized below (in thousands).

 

    2019     2018  
Professional fees   $ 165     $ 126  
Research and development costs     9       50  
Wages, bonuses and employee benefits     268       211  
Royalties and milestones     716       316  
Other     4       23  
Total   $ 1,162     $ 726