Quarterly report pursuant to Section 13 or 15(d)

Supplemental Disclosure for Statements of Cash Flows

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Supplemental Disclosure for Statements of Cash Flows
3 Months Ended
Mar. 31, 2017
Supplemental Cash Flow Elements [Abstract]  
Supplemental Disclosure for Statements of Cash Flows

During the three-month periods ended March 31, 2017 and 2016, we paid interest aggregating $7.3 million $1.3 million, respectively. During the three-month period ended March 31, 2017, we issued 1 million Series NN warrants to UCSD with an estimated fair value of $334,000. As discussed in Note 8, the liability for the additional $200,000 of investments made by Platinum was reclassified to additional paid-in-capital in January 2017.