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Notes Payable (Details 2) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2015
Dec. 31, 2014
Maturities of Long-term Debt      
Remainder 2015 $ 834 $ 834 $ 416
2016 3,333 3,333 1,667
2017 3,333 3,333 1,667
2018 2,500 2,500 1,250
Total 10,000 10,000 5,000
Less: discount for warrants and costs paid to lender (302) (302) (252)
Less: current portion (2,346) (2,346) (309)
Note payable, net of current portion and discount 7,352 7,352 $ 4,439
Credit Facility      
Maturities of Long-term Debt      
Interest expense $ 300 $ 400