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Debt Loan and Security Agreement (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Nov. 30, 2015
USD ($)
Dec. 31, 2014
USD ($)
tranche
Mar. 31, 2014
USD ($)
shares
Jun. 30, 2013
USD ($)
installment
$ / shares
shares
Dec. 31, 2016
USD ($)
installment
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
tranche
Dec. 01, 2014
USD ($)
Nov. 30, 2014
USD ($)
Debt Instrument [Line Items]                  
Debt instrument, increase (decrease), net       $ 5,000          
Cash paid for interest on debt         $ 2,149 $ 278 $ 307    
Term Loan                  
Debt Instrument [Line Items]                  
Line of credit facility, maximum borrowing capacity   $ 15,000   10,000     $ 15,000    
Number of tranches | tranche   3         3    
Debt instrument, increase (decrease), net       5,000          
Debt instrument, unused borrowing capacity, amount   $ 5,000 $ 5,000       $ 5,000    
Number of installments | installment         24        
Period after which debt is repayable   24 months              
Penalty percentage on prepayment within one year of origination   2.00%              
Penalty percentage on prepayment within two years of origination   1.00%              
Penalty percentage on prepayment after two years of origination   0.00%              
Cash paid for interest on debt   $ 14              
End of term payment amount               $ 110 $ 225
Payments of debt extinguishment costs   110              
Prepayment premium                 $ 75
Third party fee, amount paid   45              
Term Loan | Term Loan Due 2017                  
Debt Instrument [Line Items]                  
Debt instrument, increase (decrease), net       $ 5,000          
Number of installments | installment       30          
Period after which debt is repayable       18 months          
Interest rate, stated percentage       6.06%          
Penalty percentage on prepayment within one year of origination       2.25%          
Penalty percentage on prepayment within two years of origination       1.50%          
Penalty percentage on prepayment after two years of origination       0.75%          
Proceeds from (repayments of) debt   5,000              
Term Loan | Term Loan Tranche One                  
Debt Instrument [Line Items]                  
Line of credit facility, maximum borrowing capacity   5,000         $ 5,000    
Debt instrument, increase (decrease), net   5,000              
Interest rate, stated percentage           5.00%      
Term Loan | Term Loan Tranche Two                  
Debt Instrument [Line Items]                  
Line of credit facility, maximum borrowing capacity           $ 5,000      
Debt instrument, increase (decrease), net $ 5,000 $ 5,000              
Term Loan | Term Loan Tranche Three                  
Debt Instrument [Line Items]                  
Debt instrument, increase (decrease), net $ 5,000                
Convertible Preferred Stock Warrants                  
Debt Instrument [Line Items]                  
Class of warrant or right, exercise price of warrants or rights | $ / shares       $ 7.56          
Class of warrant or right, number of securities for which warrants will become exercisable in event of conversion of preferred stock into common stock | shares       24,801          
Fair value of liability       $ 175          
Remaining discount amortization period       48 months          
Issuance of common stock on cashless exercise of warrant (in shares) | shares     13,739