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Debt - Additional Information (Detail) - USD ($) |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 29, 2015 | Dec. 19, 2014 | Nov. 13, 2014 | Mar. 02, 2014 | Nov. 15, 2013 | Apr. 04, 2012 | Apr. 30, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2014 | Mar. 31, 2016 | Mar. 31, 2015 | Mar. 31, 2014
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from additional equity offering | $ 22,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price | $ 9.41 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants expiration date |  |  | Nov. 13, 2019 |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000 | $ 1,700,000 | $ 9,700,000
Non-cash interest expense amortization of debt discount |  |  |  |  |  |  |  |  |  |  |  |  | 400,000 | 500,000 | 7,700,000
Loss on extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (5,197,000)
Hercules Technology Growth Capital | Hercules Warrant |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares received from warrants received to purchase common stock |  | 58,823 |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price |  | $ 11.00 |  |  |  |  | $ 9.41 |  |  |  |  |  |  |  |
Warrants expiration date |  | Jun. 30, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Ventures International |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt conversion, shares issued |  |  |  | 663,000 |  |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  |  |  |  |  |  | $ (5,200,000) |  |  |  |  |
Senior Secured Loan | Hercules Technology Growth Capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares received from warrants received to purchase common stock |  | 58,823 |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price |  | $ 11.00 |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Convertible Debt | Capital Ventures International |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares received from warrants received to purchase common stock |  |  |  |  |  | 309,406 |  |  |  |  |  |  |  |  |
Non-cash interest expense amortization of debt discount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,100,000
Net proceeds after fees and expenses of purchase agreement |  |  |  |  |  | $ 23,200,000 |  |  |  |  |  |  |  |  |
Term Loan B | Senior Secured Loan | Hercules Technology Growth Capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal and origination costs |  |  |  |  |  |  |  |  |  |  | $ 200,000 |  |  |  |
Debt, face amount |  |  |  |  | $ 10,000,000 |  |  |  |  |  |  |  |  |  |
Net proceeds from debt |  |  |  |  | $ 9,800,000 |  |  |  |  |  |  |  |  |  |
Interest rate on loan |  |  |  |  | 11.00% |  |  |  |  |  |  |  |  |  |
End of term fee |  |  |  |  |  |  |  |  |  |  |  |  | 500,000 |  |
Minimum amount of proceeds from specified asset dispositions for mandatory prepayment feature |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 |  |
Outstanding principal balance |  |  |  |  |  |  |  |  |  |  |  |  | 2,700,000 |  |
Number of shares received from warrants received to purchase common stock |  | 25,641 |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of warrants at issuance |  | $ 200,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 |  |
Total debt discount being amortized into interest expense |  |  |  |  |  |  |  |  |  |  |  |  | 200,000 | 400,000 |
Term Loan B | Senior Secured Loan | Hercules Technology Growth Capital | Prime Rate | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prime rate |  |  |  |  | 3.75% |  |  |  |  |  |  |  |  |  |
Term Loan C | Senior Secured Loan | Hercules Technology Growth Capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal and origination costs |  |  |  |  |  |  |  |  | $ 100,000 |  |  |  |  |  |
Debt, face amount |  | 1,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from debt |  | $ 1,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |
End of term fee |  |  |  |  |  |  |  |  |  |  |  | $ 100,000 |  |  |
Debt Instrument, Maturity Date |  |  |  |  |  |  |  |  |  |  |  | Jun. 01, 2017 |  |  |
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  | 300,000 |  |
Non-cash interest expense amortization of debt discount |  |  |  |  |  |  |  |  |  |  |  |  | 100,000 |  |
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 |
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 |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of warrants at issuance |  | $ 400,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Covenant, unrestricted cash balance requirement |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,000,000 |  |
Debt Instrument, Maturity Date, Description |  |  |  |  |  |  |  |  |  |  |  |  | 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 |  |

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