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SELECTED BALANCE SHEET COMPONENTS - ACCRUED EXPENSES (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Accounts payable and accrued expenses:    
Bonus related compensation $ 1,608 $ 2,433
Employee related accruals 2,021 1,668
Clinical trial related accruals 379 422
Other 506 0
Total $ 4,514 $ 4,523