6.	Long-Term Debt

In December 2014, we entered into a Loan and Security Agreement (“Loan Agreement”) with Hercules Technology Growth Capital, Inc. (“Hercules”) under which we may borrow up to $40.0 million in two tranches.

We drew down the first tranche of $10.0 million upon closing of the transaction on December 23, 2014. The second tranche, of $30.0 million, can be drawn at our option any time prior to September 30, 2015, but only if we have achieved certain milestones relating to the ongoing HEPLISAV–B Phase 3 study (“Milestone A”). Milestone A was achieved in July 2015 as the Data and Safety Monitoring Board (“DSMB”) completed its third prespecified review and recommended that the study continue unchanged; however, no additional amounts were drawn down through the date of this quarterly report. We plan to use the proceeds received under the Loan Agreement to provide additional funding for HEPLISAV–B development and pre-commercialization activities, as a potential source of funding for clinical trials for our cancer immunotherapeutic product candidate, SD-101, and for general corporate purposes.

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%. 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”). The entire principal balance, including a balloon payment of principal, as applicable, will be due and payable on the Loan Maturity Date, which we recorded as a liability and debt discount at the origination of the loan. See Note 10 for further information regarding our Loan Agreement.

A final payment equal to $840,000 (if an aggregate of $10.0 million is advanced under the Loan Agreement) or $2,400,000 (if an aggregate of $40.0 million is advanced under the Loan Agreement) will be due on the Loan Maturity Date, or such earlier date specified in the Loan Agreement. Our obligations under the Loan Agreement are secured by a security interest in substantially all of our assets, other than our intellectual property. Additionally, we paid a $400,000 facility charge to Hercules. The debt issuance costs and final payment fee are being amortized and accreted, respectively, to interest expense over the term of the term loan using the effective interest method.

In addition, under the Loan Agreement, Hercules was granted the right, at its discretion, to participate in any subsequent financing in an aggregate amount of up to $1,500,000 (that is, a maximum amount of $1,500,000 with respect to all subsequent financings collectively) on the same terms, conditions and pricing afforded to others participating in any such subsequent financing. Such right applies to subsequent financings in which the aggregate proceeds to us are at least $15 million.

The Loan Agreement includes customary affirmative and restrictive covenants, but does not include any financial maintenance covenants, and also includes standard events of default. At June 30, 2015, we were in compliance with all loan covenants. Upon an event of default, including a change of control, Hercules has the option to accelerate repayment of the loan, including payment of any applicable prepayment charges, which is 1.50% of the outstanding loan balance and accrued but unpaid interest.

As of June 30, 2015 and December 31, 2014, we had outstanding borrowings under the Loan Agreement of $10.0 million, with a carrying value of $9.5 million and $9.6 million, respectively, net of the debt discounts. The following table summarizes our outstanding future minimum payments associated with our long-term debt as of June 30, 2015 (in thousands):

Obligations:	Total		2015		2016-2017		2018-2019		2020 and Thereafter
Principal payments on long-term debt	$	10,000	$	-	$	7,425	$	2,575	$	-
Interest payments on long-term debt		1,910		496		1,328		86		-
Total	$	11,910	$	496	$	8,753	$	2,661	$	-