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Loan Payable - Additional Information (Detail) - USD ($) | 1 Months Ended | 3 Months Ended
--- | --- | ---
Mar. 31, 2016 | Apr. 30, 2013 | Mar. 31, 2016
Debt Instrument [Line Items] |  |  |
Term of warrant | 5 years |  |
Silicon Valley Bank Loan Agreement Warrant [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Term of warrant |  |  | 10 years
Exercise price of warrants | $ 20.4408 |  | $ 20.4408
Warrant expiration period |  |  | 2023-04
Silicon Valley Bank Loan Agreement Warrant [Member] | Common Stock [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Number of shares of common stock acquired using warrant | 24,461 |  | 24,461
Silicon Valley Bank Loan Agreement [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Proceeds from loan |  | $ 9,900,000 |
Cash discount | $ 100,000 | $ 100,000 | $ 100,000
Loan term |  |  | 3 years
Annual interest rate on loan | 6.00% |  | 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
Proceeds received under loan agreement |  |  | 9,900,000
Initial carrying amount assigned to loan, net of discount | $ 9,512,000 |  | 9,512,000
Fair value allocated to warrant | 388,000 |  | 388,000
Note issuance costs |  |  | $ 117,000
Deferred financing costs, discount and accretion percentage |  |  | 9.00%
Silicon Valley Bank Loan Agreement [Member] | Restricted Money Market Account [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, collateral amount | $ 2,422,500 |  | $ 2,422,500

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