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Note 10 - Secured Notes to Related Party
 6 Months Ended
Jun. 30, 2018
Notes to Financial Statements  
Debt Disclosure [Text Block]
10.
Secured Notes to Related Party
 
Convertible Notes
 
In
April 2011,
we entered into a securities purchase agreement for a private placement of up to
$4.5
million in Convertible Notes with certain investors, including Tang Capital Partners, LP (“TCP”). TCP is controlled by Tang Capital Management, LLC (“TCM”). The manager of TCM is Kevin C. Tang, who served as a director at the time and currently serves as the Chairman of our Board of Directors. The terms of the Convertible Notes were determined by our independent directors to be
no
less favorable than terms that would be obtained in an arm’s length financing transaction. We received a total of
$4.3
million, net of issuance costs, from the issuance of these Convertible Notes.
 
The Convertible Notes are secured by substantially all of our assets, including placing our bank and investment accounts under a control agreement. The Convertible Notes bear interest at a rate of
6%
per annum, payable quarterly in cash or in additional principal amount of Convertible Notes, at the election of the purchasers. The Convertible Notes mature on
May 2, 2021;
however, the holders of the Convertible Notes
may
require prepayment of the Convertible Notes at any time, at each holder’s option.
 
The Convertible Notes are convertible into shares of our common stock at a rate of
1,250
shares for every
$1,000
of outstanding principal due under the Convertible Notes. There is
no
right to convert the Convertible Notes to the extent that, after giving effect to such conversion, the holder would beneficially own in excess of
9.99%
of our outstanding common stock. Each holder of the Convertible Notes can increase or decrease this beneficial ownership conversion limit by written notice to us, which will
not
be effective until
61
days after delivery of the notice.
 
As of
June 30, 2018,
we were in compliance with all covenants under the Convertible Notes. On the occurrence of an event of default under the Convertible Notes, the holders of the Convertible Notes have the right to require us to redeem all or a portion of their Convertible Notes.
 
In
2011,
we filed a registration statement with the SEC to register for resale
3.5
million shares underlying the Convertible Notes. The registration statement was declared effective on
July 
29,
 
2011.
The Convertible Note holders have agreed to waive their right to require us to maintain the effectiveness of the registration statement and to register the additional shares underlying the Convertible Notes until they provide notice otherwise.
 
The Convertible Notes contain an embedded conversion feature that was in-the-money on the issuance dates. Based on an effective fixed conversion rate of
1,250
shares for every
$1,000
of outstanding principal and accrued interest due under the Convertible Notes, the total conversion benefit at issuance exceeded the loan proceeds. Therefore, a debt discount was recorded in an amount equal to the face value of the Convertible Notes on the issuance dates, and we began amortizing the resultant debt discount over the respective
10
-year term of the Convertible Notes. During the
six
months ended
June 30, 2018,
accrued interest of
$0.2
million was paid-in-kind and rolled into the Convertible Note principal balance, which resulted in an additional debt discount of
$0.2
million. For the
three
months ended
June 30, 2018
and
2017,
interest expense relating to the stated rate was
$0.1
million for each period, and interest expense relating to the amortization of the debt discount was
$0.2
million for each period. For the
six
months ended
June 30, 2018
and
2017,
interest expense relating to the stated rate was
$0.2
million for each period, and interest expense relating to the amortization of the debt discount was
$0.4
million for each period.
 
As of
June 30, 2018,
the carrying value of the Convertible Notes was
$4.1
million, which is comprised of the
$6.6
million principal amount of the Convertible Notes outstanding, less debt discount of
$2.5
million. At
June 30, 2018,
the Convertible Notes were convertible into
8.2
million shares of our common stock.
 
Promissory Note
 
In
August 2016,
we entered into the Promissory Note with TCP whereby TCP agreed to lend us up to
$100.0
million. The Promissory Note has a
two
-year term and bears interest at a rate of
8%
per annum. The
first
close of
$50.0
million occurred on
August 5, 2016.
The
second
close of an additional
$50.0
million was
not
drawn and has expired. There are
no
fees,
no
warrants and
no
equity conversion features associated with this transaction. The Promissory Note is secured by a
second
-priority lien on substantially all of our assets. TCP is controlled by TCM. The manager of TCM is Kevin C. Tang, who serves as the Chairman of our Board of Directors. The terms of the Promissory Note were determined by our independent directors to be
no
less favorable than terms that would be obtained in an arm’s length financing transaction.
 
For the
three
and
six
months ended
June 30, 2018,
interest expense was
$0.5
million and
$1.0
million, respectively, compared to
$0.8
million and
$1.0
million, respectively, for the same periods in
2017.
As of
June 30, 2018,
the outstanding principal amount of the Promissory Note was
$25.0
million.