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Accrued Liabilities - Schedule of Accrued Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Accrued Liabilities Current [Abstract]    
Commissions $ 861 $ 846
Payroll and related expenses 704 1,001
Royalties 509 531
Interest payable 457 333
Final loan payment fees 478 233
Deferred rent 63 57
Other 121 145
Total accrued liabilities $ 3,193 $ 3,146