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Prepaid expenses (Tables)
12 Months Ended
Dec. 31, 2016
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Schedule of prepaid expenses

Prepaid expenses consist of the following:

 

    December 31,  
    2016     2015  
Director compensation   $ 215     $ 6  
Director and officer insurance     70        
Legal retainer     25        
Rent     17       16  
Engineering, software licenses and other     10       14  
Total accrued expenses   $ 337     $ 36