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Long-Term Debt - Additional Information (Detail) |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 23, 2014 USD ($) | Jun. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Sep. 30, 2015 USD ($) | Dec. 31, 2014 USD ($) TRANCHES
Debt Instrument [Line Items] |  |  |  |  |
Advance payment on loan agreement |  |  | $ 40,000,000 |  |
Facility charge to Hercules |  |  | 400,000 |  |
First Tranche |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Final minimum repayment of debt |  | $ 840,000 | 840,000 |  |
Advance payment on loan agreement |  |  | 10,000,000 |  |
Hercules Technology Growth Capital, Inc. (“Hercules”) |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maximum borrowing capacity |  | 1,500,000 | $ 1,500,000 |  | $ 40,000,000
Number of tranches for loan and security agreement | TRANCHES |  |  |  |  | 2
Proceeds from lines of credit |  | $ 0 |  |  |
Debt instrument, interest rate |  | 9.75% | 9.75% |  |
Debt instrument, interest rate terms |  |  | The interest rate for each tranche in the Loan Agreement is calculated at a rate equal to the greater of either: (i) 9.75% plus the prime rate as reported from time to time in The Wall Street Journal minus 5.25%, and (ii) 9.75% |  |
Debt instrument, payment terms |  |  | Payments under the Loan Agreement are interest only until February 1, 2016 (which will be extended until August 1, 2016, if we achieve Milestone A on or before September 30, 2015, and which will be extended until February 1, 2017, if we meet certain additional HEPLISAV-B Phase 3 related milestones (“Milestone B”) on or before August 1, 2016). The interest only period will be followed by equal monthly payments of principal and interest amortized over a 30 month schedule through the scheduled maturity date on July 1, 2018 (which would be extended through January 1, 2019 if we achieve Milestone A on or before September 30, 2015 or Milestone B on or before August 1, 2016) (the “Loan Maturity Date”). |  |
Debt instrument, maturity date |  |  | Jul. 01, 2018 |  |
Debt instrument, extension date |  |  | Jan. 01, 2019 |  |
Final minimum repayment of debt |  | $ 2,400,000 | $ 2,400,000 |  |
Debt instrument prepayment charge |  |  | 1.50% |  |
Outstanding borrowings |  | 10,000,000 | $ 10,000,000 |  | $ 10,000,000
Carrying value debt |  | $ 9,500,000 | 9,500,000 |  | $ 9,600,000
Hercules Technology Growth Capital, Inc. (“Hercules”) | Minimum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Proceeds from lines of credit |  |  | $ 15,000,000 |  |
Hercules Technology Growth Capital, Inc. (“Hercules”) | Prime Rate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, interest rate |  | 9.75% | 9.75% |  |
Debt instrument, basis spread on variable rate |  |  | 5.25% |  |
Hercules Technology Growth Capital, Inc. (“Hercules”) | First Tranche |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Proceeds from lines of credit | $ 10,000,000 |  |  |  |
Hercules Technology Growth Capital, Inc. (“Hercules”) | Second Tranche |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Proceeds from lines of credit |  | $ 0 |  |  |
Hercules Technology Growth Capital, Inc. (“Hercules”) | Second Tranche | Scenario Forecast |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt under Loan Agreement |  |  |  | $ 30,000,000 |
Debt instrument, maturity date |  |  | Jan. 01, 2019 |  |

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