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Accrued Expenses (Tables)
6 Months Ended
Jun. 30, 2017
Payables and Accruals [Abstract]  
Schedule of Accrued Expenses

Accrued expenses consist of the following:

    (in thousands)  
    June 30, 2017     December 31, 2016  
Compensation   $ 197     $ 297  
Professional fees     525       604  
Clinical trial expenses     463       158  
Other expenses     586       489  
    $ 1,771     $ 1,548