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Income Taxes (Schedule Of Deferred Income Tax Assets And Liabilities) (Details) (USD $)
Dec. 31, 2011
Dec. 31, 2010
Current [Member]
    
Deferred Tax Assets And Liabilities [Line Items]    
Accruals not currently deductible $ 2,465,349 $ 2,392,419
Stock based compensation 8,730,729 6,545,483
Other assets 4,874,704 4,107,951
Total deferred income tax assets 16,070,782 13,045,853
Other liabilities (327,490) (607,627)
Net deferred income taxes 15,743,292 12,438,226
Non-Current [Member]
    
Deferred Tax Assets And Liabilities [Line Items]    
Accruals not currently deductible 152,716 98,803
Stock based compensation 1,473,236 1,436,877
Impairment loss on available-for-sale securities 471,401 1,948,036
Other assets 3,809 1,897
Total deferred income tax assets 2,101,162 3,485,613
Excess tax over book depreciation (41,681,342) (25,849,074)
Patent costs (5,606,595) (2,996,184)
Unrealized gain on investments (3,027,206) (11,711,539)
Net deferred income taxes $ (48,213,981) $ (37,071,184)