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Debt - Additional Information (Detail) (USD $) | 3 Months Ended | 6 Months Ended |  |  |  |  | 0 Months Ended | 3 Months Ended | 6 Months Ended | 0 Months Ended | 6 Months Ended | 0 Months Ended |  |  |  | 6 Months Ended | 0 Months Ended | 6 Months Ended | 0 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  | 0 Months Ended | 3 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Mar. 31, 2014 | Dec. 31, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Mar. 02, 2014 Capital Ventures International | Mar. 31, 2014 Capital Ventures International | Sep. 30, 2013 Senior Convertible Debt | Sep. 30, 2013 Senior Convertible Debt | Oct. 09, 2013 Senior Convertible Debt Capital Ventures International | Apr. 04, 2012 Senior Convertible Debt Capital Ventures International | Sep. 30, 2014 Senior Convertible Debt Capital Ventures International | Mar. 02, 2014 New Unsecured Senior Convertible Note | Dec. 31, 2013 New Unsecured Senior Convertible Note | Dec. 31, 2012 New Unsecured Senior Convertible Note | Apr. 04, 2012 New Unsecured Senior Convertible Note | Sep. 30, 2014 New Unsecured Senior Convertible Note Capital Ventures International | Nov. 15, 2013 Senior Secured Loan | Sep. 30, 2014 Senior Secured Loan | Nov. 15, 2013 Senior Secured Loan Hercules Technology Growth Capital | Jun. 05, 2012 Senior Secured Loan Hercules Technology Growth Capital | Dec. 31, 2013 Senior Secured Loan Hercules Technology Growth Capital | Sep. 30, 2013 Senior Secured Loan Hercules Technology Growth Capital | Sep. 30, 2014 Senior Secured Loan Hercules Technology Growth Capital | Sep. 30, 2013 Senior Secured Loan Hercules Technology Growth Capital | Mar. 31, 2013 Senior Secured Loan Hercules Technology Growth Capital | Jun. 30, 2014 Senior Secured Loan Hercules Technology Growth Capital | Jun. 05, 2012 Senior Secured Loan Hercules Technology Growth Capital Minimum | Sep. 30, 2014 Senior Secured Loan Hercules Technology Growth Capital Maximum
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds after fees and expenses of purchase agreement |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 23,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4.85 |  |  | $ 3.10 | $ 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 | 1,841,000 |  | 1,841,000 |  | 2,601,000 |  |  |  |  |  |  |  |  | 3,800,000 |  |  |  |  |  | 500,000 |  |  |  |  |  |  |  |  |  |  |  |
Number of shares received from warrants received to purchase common stock |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,094,060 |  |  |  |  |  |  | 256,410 |  | 256,410 | 139,276 |  |  |  |  |  |  |  |
Strike price per share |  |  |  |  |  |  |  |  |  |  |  |  | $ 2.61 | $ 5.45 | $ 2.55 |  |  |  |  |  | $ 1.95 | $ 1.94 | $ 1.95 | $ 3.59 | $ 1.95 |  | $ 1.94 |  |  |  |  |
Fair value of warrants at issuance |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,000,000 |  |  |  |  |  |  |  |  |  | 400,000 |  |  |  |  |  |  |  |
Increase in derivative liability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Total debt discount being amortized into interest expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,100,000 |  |  |  |  |  |  | 200,000 |  |  | 100,000 |  |
Non-cash interest expense amortization of debt discount | 200,000 | 3,100,000 | 300,000 | 4,800,000 |  |  |  |  |  |  | 1,200,000 | 2,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000 | 100,000 | 300,000 |  |  |  | 100,000
Percentage of stock discount |  |  | 85.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of trading days for valuation of shares |  |  | 10 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-cash interest expense issuing stock at discount | 1,800,000 |  |  | 1,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt conversion, shares issued |  |  |  |  |  |  |  |  | 6,600,000 |  |  |  |  |  |  | 6,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  |  |  |  |  |  | (5,200,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal and origination costs | 10,188,000 |  | 10,188,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200,000 |  |  |  | 300,000 |  |  |
Debt, face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,000,000 | 10,000,000 |  |  |  |  |  |  |  |
Net proceeds from debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,800,000 | 9,700,000 |  |  |  |  |  |  |  |
Interest rate on loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11.00% |  |  |  |  |  |  |  |
Prime rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.75% |
End of term fee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 500,000 |  | 500,000 |  |  |
Interest expense | 500,000 | 3,500,000 | 1,000,000 | 5,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 |  | 1,200,000 |  |  |
Minimum amount of proceeds from specified asset dispositions for mandatory prepayment feature |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 |  |  |  |  |
Covenant, unrestricted cash balance requirement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,000,000 |  |  |  | 9,800,000 |  |  |  |  |
Net proceeds from sale of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,000,000 |  |  |  |  |
Repayments of term loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,500,000 |  |  |  |  |
Combined principal balances of the term loans |  | $ 10,411,000 |  | $ 10,411,000 |  | $ 10,411,000 | $ 14,389,000 | $ 15,380,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,500,000 |  |  |  |  |

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