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Debt (Details) - USD ($)
 1 Months Ended 12 Months Ended
Dec. 15, 2014
Jun. 29, 2012
Dec. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Debt:          
Notes payable     $ 25,000,000 $ 25,000,000  
Accretion of end of term charge     390,000 390,000  
Issuance fees paid to lender     (250,000) (250,000)  
Current portion of long-term debt     (3,113,000) (3,113,000)  
Long-term debt     22,027,000 22,027,000 $ 24,856,000
Future principal repayments of the Notes          
2016     2,873,000 2,873,000  
2017     12,180,000 12,180,000  
2018 (due on January 1, 2018)     9,947,000 9,947,000  
Total     25,000,000 $ 25,000,000  
Loan and Security Agreement          
Debt          
Maximum borrowing capacity of term loan $ 25,000,000 $ 20,000,000      
Commitment fee 25,000        
Facility fee 125,000        
Increase in borrowing capacity $ 5,000,000        
Maturity date extension fee     250,000    
"End of term" charge   $ 390,000      
Additional interest rate in event of default (as a percent)       5.00%  
Limit on lender's participation rights in certain future private equity financings     $ 1,000,000 $ 1,000,000  
Notes          
Debt          
Interest rate (as a percent)     9.25% 9.25%