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Borrowings (Details 2) - USD ($)
Sep. 30, 2015
Sep. 22, 2015
Dec. 31, 2014
Principal and PIK Loan Repayments      
Borrowings, net of current portion $ 29,154,000   $ 18,228,000
Loan Agreement | CRG      
Principal and PIK Loan Repayments      
2019 and thereafter 30,000,000    
Total 30,000,000    
Add: Payment in kind interest 26,000    
Borrowings, before deducting debt financing costs 30,026,000    
Less: Amount representing debt financing costs (872,000) $ (876,000)  
Borrowings, net of current portion $ 29,154,000