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Loan Payable - Additional Information (Detail) (USD $) | 6 Months Ended |  | 1 Months Ended
--- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2013 Silicon Valley Bank Loan Agreement Warrant [Member] | Jun. 30, 2013 Silicon Valley Bank Loan Agreement Warrant [Member] Common Stock [Member] | Apr. 30, 2013 Silicon Valley Bank [Member]
Debt Instrument [Line Items] |  |  |  |
Proceeds from loan |  |  |  | $ 9,900,000
Term of loan | 3 years |  |  |
Annual interest rate on loan | 6.00% |  |  |
Period of loan subject to interest payments only | 6 months |  |  |
Period of loan subject to principal and interest payments | 30 months |  |  |
Final fee payment at the end of loan term | 1,000,000 |  |  |
Term of warrants expiration |  | 10 years |  |
Number of shares of common stock acquired using warrants |  |  | 293,531 |
Exercise price of warrants |  | 1.7034 |  |
Warrants expiration period |  | April 2023 |  |
Initial carrying amount assigned to loan, net of discount | 9,512,000 |  |  |
Proceeds received under loan agreement | 9,900,000 |  |  |
Fair value allocated to warrant | 388,000 |  |  |
Note issuance costs | 117,000 |  |  |
Cash discount | $ 100,000 |  |  |
Deferred financing costs, discount and accretion percentage | 9.00% |  |  |

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