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Income Taxes (Schedule of Income Tax Provision) (Details) (USD $)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income Taxes [Abstract]              
Statutory federal tax benefit         $ (1,604,648) $ (1,291,175) $ (11,848,754)
State income tax, net of federal benefit         (19,918) (232,489) (1,284,265)
Other permanent differences         4,975 22,101 607,981
Foreign rate differential         (80,292) (50,173) 2,492,478
Rate change         388,656      
Lobbying costs         122,204      
Write-off of expired/forfeited options and conversion of notes         193,605 391,826 3,071,189
Canada transfer pricing and expiring attributes            (8,965,832)   
Expiration (reversal of expiration) of net operating losses            (4,745,271) 5,053,927
Other         1,393,366 732,322 309,840
Subtotal         397,948 (14,138,691) (1,597,604)
Decrease (increase) in valuation allowance         (202,451) 14,138,691 1,597,604
Income tax expense $ 11,206 $ 16,133 $ 20,949 $ 166,538 $ 195,497