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Debt - Additional Information (Detail) - USD ($)
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Apr. 29, 2015
Dec. 19, 2014
Nov. 13, 2014
Nov. 15, 2013
Jun. 05, 2012
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Mar. 31, 2013
Debt Instrument [Line Items]                          
Strike price per share $ 9.41                        
Interest expense           $ 300,000   $ 500,000   $ 600,000 $ 1,000,000    
Non-cash interest expense amortization of debt discount           100,000   200,000   200,000 300,000    
Proceeds from additional equity offering $ 22,300,000   $ 9,100,000                    
Senior Secured Loan                          
Debt Instrument [Line Items]                          
Number of shares received from warrants received to purchase common stock       25,641                  
Strike price per share     $ 17.00 $ 19.50                  
Senior Secured Loan | Hercules Technology Growth Capital                          
Debt Instrument [Line Items]                          
Number of shares received from warrants received to purchase common stock   58,823                      
Strike price per share $ 9.41 $ 11.00 $ 17.00           $ 19.50        
Term Loan | Senior Secured Loan | Hercules Technology Growth Capital                          
Debt Instrument [Line Items]                          
Number of shares received from warrants received to purchase common stock         13,927                
Strike price per share         $ 35.90                
Fair value of warrants at issuance         $ 400,000                
Debt, face amount         10,000,000                
Net proceeds from debt         $ 9,700,000                
Interest rate on loan         11.00%                
Interest expense                         $ 1,200,000
Non-cash interest expense amortization of debt discount                     100,000    
Covenant, unrestricted cash balance requirement       $ 5,000,000   2,000,000       $ 2,000,000      
Debt Instrument, Maturity Date, Description                   As part of the Hercules Second Amendment, this Minimum Threshold was amended to be the lower of $5.0 million or the aggregate outstanding principal balance of the Term Loans. As a result of the Company’s April 2015 equity offering, the Minimum Threshold was reduced to the lesser of $2.0 million or the aggregate outstanding principal balance of the Term Loans.      
Repayments of term loan                   $ 2,000,000      
Term Loan | Senior Secured Loan | Hercules Technology Growth Capital | Maximum                          
Debt Instrument [Line Items]                          
Non-cash interest expense amortization of debt discount               100,000          
Term Loan | Senior Secured Loan | Hercules Technology Growth Capital | Prime Rate | Minimum                          
Debt Instrument [Line Items]                          
Prime rate         3.75%                
Term Loan B | Senior Secured Loan | Hercules Technology Growth Capital                          
Debt Instrument [Line Items]                          
Number of shares received from warrants received to purchase common stock       25,641                  
Strike price per share       $ 19.50                  
Debt, face amount       $ 10,000,000                  
Net proceeds from debt       $ 9,800,000                  
Interest expense                   1,000,000      
Legal and origination costs                 $ 200,000        
End of term fee                   500,000      
Total debt discount being amortized into interest expense           100,000   $ 100,000   200,000 $ 200,000    
Minimum amount of proceeds from specified asset dispositions for mandatory prepayment feature           1,000,000       1,000,000      
Outstanding principal balance           5,700,000       5,700,000      
Term Loan C | Senior Secured Loan | Hercules Technology Growth Capital                          
Debt Instrument [Line Items]                          
Number of shares received from warrants received to purchase common stock   58,823                      
Strike price per share   $ 11.00                      
Debt, face amount   $ 1,500,000                      
Net proceeds from debt   $ 1,400,000                      
Interest expense                       $ 300,000  
Legal and origination costs             $ 100,000            
End of term fee                       $ 100,000  
Debt Instrument, Maturity Date                       Jun. 01, 2017  
Term Loan C | Senior Secured Loan | Hercules Technology Growth Capital | Minimum                          
Debt Instrument [Line Items]                          
Proceeds from additional equity offering           10,000,000              
Term Loan C | Senior Secured Loan | Hercules Technology Growth Capital | Maximum                          
Debt Instrument [Line Items]                          
Non-cash interest expense amortization of debt discount           $ 100,000       $ 100,000