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Accrued Liabilities - Summary of Accrued Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Accrued Liabilities Current [Abstract]    
Payroll and related expenses $ 2,839 $ 859
Research and clinical expenses 1,562 276
Legal and professional expenses 296 418
Other accrued expenses 215 142
Total $ 4,912 $ 1,695