Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments - Additional Information (Detail)

v2.4.0.6
Derivative Instruments - Additional Information (Detail) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Derivative          
Reclassification to additional paid-in capital resulting from exercise of warrants       $ 1,400,000  
Net increases in the estimated fair values of the derivative liabilities (92,805) (10,352) (276,889) (964,141)  
Total estimated fair value of the remaining derivative liabilities 793,418   793,418   568,930
Series V Warrants
          
Derivative          
Warrants exercised     20,000 810,000  
Reclassification to additional paid-in capital resulting from exercise of warrants     $ 52,000    
Series CC Warrants
          
Derivative          
Warrants exercised       1,578,948  
Series DD Warrants
          
Derivative          
Warrants exercised       1,194,211  
Series Z Warrants
          
Derivative          
Warrants exercised       60,000