Loan Agreements - Additional Information (Detail)
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1 Months Ended |
6 Months Ended |
12 Months Ended |
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Apr. 10, 2015
shares
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Jan. 08, 2015
USD ($)
Tranches
$ / shares
shares
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Jan. 31, 2015
USD ($)
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Aug. 31, 2012
USD ($)
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Mar. 31, 2012
USD ($)
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Dec. 31, 2011
USD ($)
$ / shares
shares
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Aug. 31, 2012
USD ($)
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Dec. 31, 2015
USD ($)
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Dec. 31, 2014
USD ($)
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Dec. 31, 2013
USD ($)
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Dec. 15, 2015
USD ($)
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Nov. 24, 2015
USD ($)
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Apr. 30, 2014
shares
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Aug. 31, 2013 |
| Debt Instrument [Line Items] |
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| Principal outstanding under the Term Loan |
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$ 20,324,000
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| Proceeds from sale of common stock |
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2,628,000
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$ 140,000
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$ 35,000
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| Unamortized deferred financing costs |
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200,000
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| Unamortized discount on debt, relating to warrants |
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500,000
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| Proceeds from loan payable |
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21,000,000
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| Debt instrument stated interest rate |
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7.00%
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| Accrued interest |
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$ 136,000
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574,000
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| Common Stock [Member] |
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| Debt Instrument [Line Items] |
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| Issuance of Common Stock, shares | shares |
6,716,000
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| Hercules Loan Agreement [Member] | Term Loan [Member] |
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| Debt Instrument [Line Items] |
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| Prior written notice period to prepay term loan |
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7 days
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| Loan and Security Agreement with Lighthouse Capital [Member] |
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| Debt Instrument [Line Items] |
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| Accrued interest |
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$ 574,000
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| Loan and Security Agreement with Lighthouse Capital [Member] | Loans payable [Member] |
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| Debt Instrument [Line Items] |
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| Loan and security agreement, maximum borrowing capacity |
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$ 10,000,000
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| Unamortized discount on debt, relating to warrants |
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$ 200,000
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| Proceeds from loan payable |
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$ 5,000,000
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$ 5,000,000
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$ 10,000,000
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| Loan and security agreement, borrowings repayment period |
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36 months
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| Debt instrument stated interest rate |
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8.25%
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| Loan and security agreement, borrowings repayment start date |
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Dec. 01, 2012
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| Line of credit facility, additional interest payment |
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$ 600,000
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| Repayments of notes payable |
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3,600,000
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| Loan and Security Agreement with Lighthouse Capital [Member] | Loans payable [Member] | Series D Convertible Preferred Stock [Member] |
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| Debt Instrument [Line Items] |
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| Exercise price of warrant | $ / shares |
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$ 12.04
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| Warrant expiration date |
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2021-12
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| Warrant expiration period |
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10 years
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| Loan and Security Agreement with Lighthouse Capital [Member] | Loans payable [Member] | Common Stock [Member] |
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| Debt Instrument [Line Items] |
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| Warrant to purchase stock, number of securities called by warrants or rights | shares |
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66,436
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| Loan and Security Agreement with Lighthouse Capital [Member] | Maximum [Member] | Loans payable [Member] | Series D Convertible Preferred Stock [Member] |
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| Debt Instrument [Line Items] |
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| Warrant to purchase stock, number of securities called by warrants or rights | shares |
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66,436
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| Hercules Technology Growth Capital, Inc. [Member] | Hercules Loan Agreement [Member] | Stock Purchase Agreement [Member] |
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| Debt Instrument [Line Items] |
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| Issuance of Common Stock, shares | shares |
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135,501
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| Issuance/sale of stock, price per share | $ / shares |
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$ 7.38
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| Proceeds from sale of common stock |
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$ 1,000,000
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| Hercules Technology Growth Capital, Inc. [Member] | Hercules Loan Agreement [Member] | Term Loan [Member] |
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| Debt Instrument [Line Items] |
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| Loan and security agreement, maximum borrowing capacity |
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$ 26,000,000
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| Principal outstanding under the Term Loan |
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$ 21,000,000
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| Term loan facility, maturity date |
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Jul. 01, 2018
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| Term loan facility, interest rate terms |
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The Term Loan will mature on July 1, 2018. Each advance under the Term Loan accrues interest at a floating per annum rate equal to the greater of (i) 7.30% or (ii) the sum of 7.30% plus the prime rate minus 5.75%. The Term Loan provided for interest-only payments on a monthly basis until December 31, 2015.
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| Additional interest rate during an event of default |
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5.00%
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| Term loan facility, interest rate |
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7.30%
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| Debt prepayment charge, after twelve months |
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2.00%
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| Debt prepayment charge, after twenty-four months |
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1.00%
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| Final payment as percentage of aggregate original principal amount |
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6.70%
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| Class of warrant or right, date until which warrants exercisable |
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Jan. 08, 2020
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| Estimated fair value of warrant |
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$ 824,000
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| Hercules Technology Growth Capital, Inc. [Member] | Hercules Loan Agreement [Member] | Term Loan [Member] | Common Stock [Member] |
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| Debt Instrument [Line Items] |
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| Exercise price of warrant | $ / shares |
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$ 6.05
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| Warrant to purchase stock, number of securities called by warrants or rights | shares |
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171,901
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| Hercules Technology Growth Capital, Inc. [Member] | Hercules Loan Agreement [Member] | Term Loan [Member] | Prime Rate [Member] |
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| Debt Instrument [Line Items] |
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| Term loan facility, interest rate spread |
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5.75%
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| Hercules Technology Growth Capital, Inc. [Member] | Hercules Loan Agreement [Member] | Term Loan [Member] | Borrowing One [Member] |
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| Debt Instrument [Line Items] |
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| Loan and security agreement, maximum borrowing capacity |
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$ 15,000,000
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| Hercules Technology Growth Capital, Inc. [Member] | Hercules Loan Agreement [Member] | Term Loan [Member] | Second Tranche [Member] |
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| Debt Instrument [Line Items] |
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| Loan and security agreement, maximum borrowing capacity |
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$ 6,000,000
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| Hercules Technology Growth Capital, Inc. [Member] | Hercules Loan Agreement [Member] | Term Loan [Member] | Up on Meeting Certain Clinical Milestone on or Prior to Dec. 15, 2015 [Member] |
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| Debt Instrument [Line Items] |
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| Loan and security agreement, maximum borrowing capacity |
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$ 5,000,000
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| Hercules Technology Growth Capital, Inc. [Member] | Hercules Loan Agreement [Member] | Term Loan [Member] | Maximum [Member] |
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| Debt Instrument [Line Items] |
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| Number of tranches | Tranches |
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3
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