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Debt - Additional Information (Detail) (USD $)
 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 0 Months Ended 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 1 Months Ended 0 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 0 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Mar. 31, 2013
Sep. 30, 2013
Senior Convertible Debt
Sep. 30, 2012
Senior Convertible Debt
Sep. 30, 2013
Senior Convertible Debt
Sep. 30, 2012
Senior Convertible Debt
Apr. 04, 2012
Senior Convertible Debt
Apr. 04, 2012
Senior Convertible Debt
Capital Ventures International
Apr. 04, 2010
Senior Convertible Debt
Capital Ventures International
Dec. 31, 2012
Senior Convertible Debt
Capital Ventures International
Dec. 31, 2012
New Unsecured Senior Convertible Note
Capital Ventures International
Dec. 03, 2012
New Unsecured Senior Convertible Note
Capital Ventures International
Sep. 30, 2013
New Unsecured Senior Convertible Note
Capital Ventures International
Mar. 31, 2013
New Unsecured Senior Convertible Note
Capital Ventures International
Dec. 31, 2012
New Unsecured Senior Convertible Note
Capital Ventures International
Minimum
Dec. 31, 2012
New Unsecured Senior Convertible Note
Capital Ventures International
Maximum
Jun. 05, 2012
Senior Secured Term Loan
Hercules Technology Growth Capital
Sep. 30, 2013
Senior Secured Term Loan
Hercules Technology Growth Capital
Sep. 30, 2012
Senior Secured Term Loan
Hercules Technology Growth Capital
Sep. 30, 2013
Senior Secured Term Loan
Hercules Technology Growth Capital
Sep. 30, 2012
Senior Secured Term Loan
Hercules Technology Growth Capital
Mar. 31, 2013
Senior Secured Term Loan
Hercules Technology Growth Capital
Jun. 05, 2012
Senior Secured Term Loan
Hercules Technology Growth Capital
Minimum
Debt Instrument [Line Items]                                                    
Interest rate percentage                   7.00%                                
Net proceeds after fees and expenses of purchase agreement                     $ 23,200,000                              
Conversion price                       $ 4.85           $ 3.19 $ 4.85              
Premium over closing price, percentage                       20.00%                            
Period before first installment payment                     4 months                              
Shares registered for resale                     10,262,311                              
Derivative liability of note 2,807,000   2,807,000   4,162,000           3,800,000     1,500,000                        
Number of shares received from warrants received to purchase common stock                     3,094,060                 139,276            
Strike price per share                     $ 5.45                 $ 3.59            
Fair value of warrants at issuance                     7,000,000           25,000,000     400,000            
Legal and origination costs                                 1,800,000               300,000  
Amendment covenant description                            Allowed the Company to convert, subject to the satisfaction of certain conditions set forth in the Exchanged Note, (a) at least $2.5 million of the approximately $5.3 million installment amount payable with respect to the January 2013 installment date (including approximately $4.2 million of deferred installment amounts from the period September 4, 2012 to December 3, 2012) into shares of the Company’s common stock (on December 21, 2012 the Company converted $3.8 million in deferred installment amount principal and interest and issued 1,715,443 shares of common stock), and (b) the balance of the January 2013 installment amount in equal amounts on each of the February and March 2013 installment dates;  Reduced the price failure equity condition with respect to a particular date of determination from $2.50 to $1.00;  Reduced the aggregate daily dollar trading volume equity condition required for at least 25 of the 30 consecutive trading days immediately preceding a date of determination from $1,500,000 to $850,000 per trading day. In addition, if the aggregate daily dollar trading volume is between $50,000 and $850,000, the Company may still convert into common stock a portion of an installment amount payable with respect to an installment date equal to the quotient of (x) the aggregate daily dollar trading volume, divided by (y) $850,000;  Increased CVI’s beneficial ownership limitation under the Exchanged Note from 4.99% to 9.99%; and  Reduced the conversion price, from $4.85 per share of the Company’s common stock to $3.19 per share of the Company’s common stock, subject to certain price-based and other anti-dilution adjustments.                        
Portion of installment payment to be converted                                   2,500,000                
Installment amount of note payable                           5,300,000                        
Deferred installment payments of note payable                             4,200,000                      
Convertible amount of installment payment     7,831,000 2,676,000                   3,800,000                        
Number of shares issued for converted payment                           1,715,443                        
Price failure equity condition                                   $ 1.00 $ 2.50              
Aggregate daily dollar trading volume                         1,500,000 850,000       50,000 850,000              
Minimum number of consecutive trading days for reducing daily dollar trading                           25 days                        
Number of trading days immediately preceding date of determination                           30 days                        
Beneficial ownership limitation percentage                                   4.99% 9.99%              
Increase in derivative liability                           500,000   500,000                    
Total debt discount being amortized into interest expense                           13,100,000                        
Non-cash interest expense amortization of debt discount 3,100,000 2,300,000 4,800,000 4,400,000   1,200,000 2,100,000 2,700,000 4,200,000                       100,000 200,000 300,000 300,000    
Percentage of stock discount     85.00%                                              
Non-cash interest expense issuing stock at discount 1,800,000 200,000 1,800,000 200,000                                            
Number of trading days for valuation of shares     10 days                                              
Senior secured term loan                                       10,000,000            
Proceeds from the issuance of debt, net of expenses                                       9,700,000            
Interest rate on loan                                       11.00%            
Prime rate                                                   3.75%
End of term fee                                                 500,000  
Interest expense 3,500,000 3,000,000 5,600,000 5,700,000                                         1,200,000  
Covenant, unrestricted cash balance requirement                                         $ 10,000,000   $ 10,000,000