Quarterly report pursuant to Section 13 or 15(d)

Warrant Liability (Details Textual)

v2.4.0.8
Warrant Liability (Details Textual) (USD $)
9 Months Ended 1 Months Ended 3 Months Ended 1 Months Ended 1 Months Ended 2 Months Ended 1 Months Ended 1 Months Ended 2 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Mar. 15, 2011
Apr. 30, 2012
Institutional Investor [Member]
Common Stock [Member]
Mar. 31, 2013
Series A Warrants [Member]
Apr. 30, 2012
Series A Warrants [Member]
Institutional Investor [Member]
Apr. 09, 2012
Series A Warrants [Member]
Institutional Investor [Member]
Oct. 31, 2012
Series B Warrants [Member]
Sep. 30, 2012
Series B Warrants [Member]
Oct. 31, 2012
Series B Warrants [Member]
Apr. 30, 2012
Series B Warrants [Member]
Institutional Investor [Member]
Apr. 09, 2012
Series B Warrants [Member]
Institutional Investor [Member]
Mar. 31, 2011
Deerfield Warrant [Member]
Mar. 31, 2013
Deerfield Warrant [Member]
Sep. 30, 2013
Deerfield Warrant [Member]
Apr. 30, 2012
Deerfield Warrant [Member]
Mar. 15, 2011
Deerfield Warrant [Member]
Warrants to Purchase Common Stock Shares           6,517,648         6,517,648   6,000,000        
Class of Warrant or Right, Exercise Price of Warrants or Rights     1.57       1.15 0.85   0.85   0.85       1.25 1.57
Debt Instrument, Increase (Decrease), Net, Total                           $ 7,500,000      
Stock Issued During Period Shares Private Placement       6,517,648                          
Class of Warrant or Right, Date from which Warrants or Rights Exercisable                             Mar. 15, 2017    
Class of Warrant or Right Exercised During Period         1,109,010     4,627,941 1,133,824 5,761,765       6,000,000      
Proceeds from Warrant Exercises $ 1,275,000 $ 963,000     $ 1,275,000     $ 3,934,000 $ 964,000                
Class Of Warrant Or Right Subject To Expiry         5,408,638                        
Investment Warrants Expiration Date         Apr. 30, 2018         Oct. 31, 2012              
Class Of Warrant Or Right Expiry Term           six-year         six-month            
Class Of Warrant Or Right Expired During Period                   755,883