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Debt - Additional Information (Detail) - USD ($) |  |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 29, 2015 | Dec. 19, 2014 | Nov. 15, 2013 | Jun. 05, 2012 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2013
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Strike price per share | $ 9.41 |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  | $ 200,000 | $ 400,000 |  | $ 800,000 | $ 1,400,000 |
Non-cash interest expense amortization of debt discount |  |  |  |  | 100,000 | 100,000 |  | 300,000 | 500,000 |
Proceeds from additional equity offering | $ 22,300,000 |  |  |  |  |  |  |  |  |
Senior Secured Loan | Hercules Technology Growth Capital |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares received from warrants received to purchase common stock |  | 58,823 |  |  |  |  |  |  |  |
Strike price per share | $ 9.41 | $ 11.00 |  |  |  |  |  |  |  |
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 | 400,000 |
Minimum amount of proceeds from specified asset dispositions for mandatory prepayment feature |  |  |  |  | 1,000,000 |  |  | 1,000,000 |  |
Outstanding principal balance |  |  |  |  | 3,700,000 |  |  | 3,700,000 |  |
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 |  | $ 100,000 | $ 100,000 |

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