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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
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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 |  |  |

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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Carrying amount of collateralized debt obligations with maturities initially due after one year or beyond the operating cycle, if longer, excluding the current portion. Obligations include, but not limited to, mortgage loans, chattel loans, and other borrowings secured by assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_SecuredLongTermDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant