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Notes Payable - Maturities of Long-Term Debt (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Maturities of Long-term Debt      
Note payable, net of current portion and discount $ 5,742 $ 4,439  
Term Loan A      
Maturities of Long-term Debt      
2015 3,334    
2016 3,333    
2017 2,500    
Total 9,167    
Less: discount for warrants and costs paid to lender (220)    
Less: current portion (3,205)    
Note payable, net of current portion and discount 5,742    
Credit Facility      
Maturities of Long-term Debt      
Interest expense $ 1,000 $ 200 $ 0