Quarterly report pursuant to Section 13 or 15(d)

STOCKHOLDERS' EQUITY

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STOCKHOLDERS' EQUITY
 6 Months Ended
Jun. 30, 2014
Equity [Abstract]  
Stockholders' Equity Note Disclosure [Text Block]
5. STOCKHOLDERS’ EQUITY
 
Common Stock Warrants
 
The following table summarizes information with regard to outstanding warrants to purchase common stock as of June 30, 2014.
 
Offering
 
Number of Shares 
Issuable Upon 
Exercise of 
Outstanding 
Warrants
 
Exercise 
Price
 
Expiration Date
 
 
 
 
 
 
 
 
 
 
February 2014 Private Placement (1)
 
400,000
 
$
20.00
 
February 6, 2019
 
February 2013 Public Offering (2)
 
550,000
 
 
10.00
 
February 20, 2018
 
February 2013 Public Offering – Placement Agents
 
38,496
 
 
12.50
 
February 4, 2018
 
November 2012 Private Placement
 
50,000
 
 
25.00
 
November 2, 2017
 
June 2012 Public Offering
 
149,069
 
 
25.00
 
June 13, 2017
 
December 2011 Underwritten Offering
 
462,411
 
 
12.00
 
December 6, 2016
 
April 2011 Private Placement
 
302,922
 
 
15.00
 
March 31, 2016
 
Legacy warrants (2)
 
1,365
 
 
10.00
 
July 27, 2015
 
Legacy warrants
 
5,252
 
 
321.30
 
July 27, 2015
 
Legacy warrants
 
4,570
 
 
1,989.00 - 2,019.60
 
December 31, 2015
 
Total
 
1,964,085
 
 
 
 
 
 
 
(1)
Warrants issued in connection with the sale of convertible debentures. As described in Note 3, the warrants are only exercisable following conversion of the associated debentures.
(2)
The exercise prices of these warrants are subject to adjustment for “down-rounds” and the warrants have been accounted for as a derivative instrument as described in Note 2.