Annual report pursuant to Section 13 and 15(d)

Debt - Additional Information (Detail)

v3.3.1.900
Debt - Additional Information (Detail) - USD ($)
12 Months Ended
Aug. 07, 2015
Sep. 30, 2013
Dec. 31, 2015
Dec. 31, 2013
Debt Instrument [Line Items]        
Facility loan, drawn     $ 9,482,000  
Issued warrants to purchase common stock     114,436  
Exercise price of common stock     $ 2.84  
Warrant term     10 years  
Warrants [Member]        
Debt Instrument [Line Items]        
Fair value of warrant liabilities   $ 300,000    
Warrants, Exercise Price of $5.00 Per Share [Member]        
Debt Instrument [Line Items]        
Issued warrants to purchase common stock   121,739    
Exercise price of common stock   $ 5.00    
Warrant term       7 years
2013 Term Loan Facility [Member]        
Debt Instrument [Line Items]        
Maximum borrowing capacity   $ 10,000,000    
Facility loan, interest amortization period   36 months    
Facility loan, final interest payment   $ 300,000    
Retiring of existing debt $ 4,100,000      
2013 Term Loan Facility [Member] | First Tranche [Member]        
Debt Instrument [Line Items]        
Facility loan, drawn   $ 5,000,000    
Facility loan, fixed interest rate   8.75%    
2013 Term Loan Facility [Member] | Second Tranche [Member]        
Debt Instrument [Line Items]        
Facility loan, fixed interest rate     8.75%  
Facility loan available for draw down   $ 5,000,000    
2013 Term Loan Facility [Member] | Second Tranche [Member] | Wall Street Journal Prime Rate [Member]        
Debt Instrument [Line Items]        
Facility loan, prime rate plus     4.25%  
2015 Term Loan Facility [Member]        
Debt Instrument [Line Items]        
Maximum borrowing capacity $ 15,000,000      
Debt instrument payment terms     Under the first tranche, the Company is required to make 12 monthly interest only payments after the funding date followed by a repayment schedule equal to 36 equal monthly payments of interest and principal.  
Percentage of principal amount as final payment 6.50%      
Prepayment fee percentage 3.00%      
Facility fee 1.00%      
2015 Term Loan Facility [Member] | Minimum [Member]        
Debt Instrument [Line Items]        
Upfront Payment $ 35,000,000      
Present value of the future cash flows 10.00%      
2015 Term Loan Facility [Member] | First Tranche [Member]        
Debt Instrument [Line Items]        
Facility loan, drawn $ 10,000,000      
Facility loan, fixed interest rate 8.77%      
2015 Term Loan Facility [Member] | First Tranche [Member] | Minimum [Member]        
Debt Instrument [Line Items]        
Facility loan, fixed interest rate 8.75%      
2015 Term Loan Facility [Member] | First Tranche [Member] | Wall Street Journal Prime Rate [Member] | Minimum [Member]        
Debt Instrument [Line Items]        
Facility loan, fixed interest rate 8.47%      
2015 Term Loan Facility [Member] | Second Tranche [Member]        
Debt Instrument [Line Items]        
Facility loan, drawn $ 0      
Facility loan available for draw down $ 5,000,000