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Schedule II - Valuation and qualifying accounts
 12 Months Ended
Dec. 31, 2013
Valuation and Qualifying Accounts [Abstract]  
Schedule II - Valuation and qualifying accounts
YEARS ENDED DECEMBER 31, 2013, 2012 AND 2011
Note Description
Balance at
Beginning of
Year
 
Additions
 
Deductions
 
Balance at End
of Year
Year ended December 31, 2013
 

 
 

 
 
 
 

Tax valuation allowance
$
49,600,420

 
$
7,111,905

 
$
—

 
$
56,712,325

Year ended December 31, 2012
 

 
 

 
 

 
 

Tax valuation allowance
$
39,133,355

 
$
10,467,065

 
$
—

 
$
49,600,420

Year ended December 31, 2011
 

 
 

 
 

 
 

Tax valuation allowance
$
35,235,982

 
$
3,897,373

 
$
—

 
$
39,133,355