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Prepaid Expenses and Other Current Assets (Tables)
 9 Months Ended
Sep. 30, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Schedule of Prepaid Expenses and Other Current Assets

Prepaid expenses and other current assets consisted of the following:

 

    September 30,     December 31,  
    2018     2017  
Prepaid insurance   $ 328     $ 164  
Other prepaid expenses     611       426  
Amounts due from Surface Pharmaceuticals     50       -  
Deposits and other current assets     125       124  
Total prepaid expenses and other current assets   $ 1,114     $ 714