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Consolidated Balance Sheets (USD $)
Mar. 31, 2013
Dec. 31, 2012
Assets    
Cash and cash equivalents $ 7,815,306 $ 8,390,233
Short term investments 5,052,921 5,052,921
Royalty receivables, net of reserves of $92,723 in 2013 and 2012 798,259 688,318
Prepaid expenses and other current assets 88,080 201,949
Total current assets 13,754,566 14,333,421
Fixed assets, net 59,847 59,041
Deposits and other assets 22,605 22,605
Total assets 13,837,018 14,415,067
Liabilities and Shareholders' Equity    
Accounts payable 170,888 72,269
Accrued expenses and other current liabilities 177,758 145,123
Deferred revenue 191,250 25,000
Total current liabilities 539,896 242,392
Commitments and Contingencies      
Shareholders' equity:    
Capital stock, par value $0.0001 per share; authorized 100,000,000 shares, issued and outstanding 22,916,095 and 22,646,782 shares for 2013 and 2012 2,293 2,265
Additional paid-in capital 102,355,900 101,642,297
Accumulated deficit (89,061,071) (87,471,887)
Total shareholders' equity 13,297,122 14,172,675
Total liabilities and shareholders' equity $ 13,837,018 $ 14,415,067