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Debt and Notes Payable (Details)
1 Months Ended 3 Months Ended 11 Months Ended 52 Months Ended
Nov. 07, 2014
USD ($)
loan
$ / shares
shares
Jan. 01, 2013
installments
Nov. 30, 2014
USD ($)
Jun. 30, 2011
USD ($)
shares
Mar. 31, 2016
USD ($)
shares
Dec. 31, 2011
USD ($)
Sep. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
shares
Mar. 31, 2015
USD ($)
Credit facility                  
Annual increments payable towards the commitment fee         $ 50,000        
Termination fee from first to third anniversary         $ 50,000        
Preferred stock warrants                  
Credit facility                  
Number of shares of common stock under warrants issued to counterparty | shares         0        
Common stock warrants                  
Credit facility                  
Number of shares of common stock under warrants issued to counterparty | shares         751,779     751,779  
WTI | Term loan | Second tranche                  
Credit facility                  
Amount borrowed           $ 5,000,000      
Massachusetts Development Finance Agency | Term loan                  
Credit facility                  
Maximum amount committed by the lenders under the loan and security agreement       $ 1,400,000.0          
Amount borrowed             $ 1,400,000    
Period for borrowing remaining funds       18 months          
Outstanding advances         $ 400,000     $ 500,000  
Fixed interest rate (as a percent)         6.50%        
Number of equal monthly installments | installments   66              
Credit facility term       84 months          
Massachusetts Development Finance Agency | Term loan | Term Loan Tranche One                  
Credit facility                  
Amount borrowed       $ 600,000          
2014 Secured Loan Agreement                  
Credit facility                  
Additional interest rate if event of default occurs (as a percent)         5.00%        
2014 Secured Loan Agreement | Revolving Line                  
Credit facility                  
Maximum amount committed by the lenders under the loan and security agreement         $ 5,000,000        
Outstanding advances                 $ 0
Borrowing base as a percentage of eligible accounts receivable         85.00%        
Fee to be amortized over the term of the facility $ 250,000                
2014 Secured Loan Agreement | Term loan                  
Credit facility                  
Maximum amount committed by the lenders under the loan and security agreement         $ 10,000,000        
Number of loans | loan 2                
Final payment fee (as a percent)         7.00%        
Prepayment fee on or prior to first anniversary (as a percent)         3.00%        
2014 Secured Loan Agreement | Term loan | SVB/Oxford Term Loan A                  
Credit facility                  
Amount borrowed $ 10,000,000   $ 10,000,000            
Fixed interest rate (as a percent)         7.25%        
2014 Secured Loan Agreement | Term loan | SVB/Oxford Term Loan A | Common stock warrants                  
Credit facility                  
Number of shares of common stock under warrants issued to counterparty | shares 33,481                
Discount recorded to additional paid-in capital for fair value of warrants $ 134,000                
Exercise price of warrants issued to counterparty (in dollars per share) | $ / shares $ 8.96                
2014 Secured Loan Agreement | Term loan | SVB/Oxford Term Loan A | Prime Rate                  
Credit facility                  
Margin rate (as a percent) 4.00%                
2014 Secured Loan Agreement | Term loan | SVB/Oxford Term Loan B                  
Credit facility                  
Maximum amount committed by the lenders under the loan and security agreement         $ 10,000,000        
2014 Secured Loan Agreement | Term loan | SVB/Oxford Term Loan B | Common stock warrants                  
Credit facility                  
Shares of common stock under warrants obligated to be issued if loan is utilized | shares         33,481        
2014 Secured Loan Agreement | Term loan | SVB/Oxford Term Loan B | Prime Rate                  
Credit facility                  
Margin rate (as a percent)         4.00%        
Series D convertible preferred stock | Massachusetts Development Finance Agency | Term loan | Preferred stock warrants                  
Credit facility                  
Number of shares of common stock under warrants issued to counterparty | shares       16,000          
Discount recorded to additional paid-in capital for fair value of warrants       $ 46,000