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Consolidated Balance Sheets - USD ($)
Jun. 30, 2015
Dec. 31, 2014
Current assets:    
Cash and cash equivalents $ 5,594,919 $ 7,569,537
Short term investments 1,503,790 1,501,554
Royalty receivables, net of reserves of $305,171 in 2015 and 2014 1,727,282 1,175,218
Prepaid expenses and other current assets 94,656 121,252
Total current assets 8,920,647 10,367,561
Fixed assets, net 927,056 660,201
Long-term investments 1,508,604 1,503,525
Deposits and other assets 33,567 33,567
Total assets 11,389,874 12,564,854
Current liabilities:    
Accounts payable 100,390 159,312
Accrued expenses and other 265,704 $ 323,372
Deferred revenue 22,722  
Total current liabilities 388,816 $ 482,684
Shareholders' equity:    
Common stock, par value $0.0001 per share; authorized 100,000,000 shares, issued and outstanding 24,030,846 and 23,924,465 shares for 2015 and 2014 2,403 2,392
Additional paid-in capital 110,827,022 110,210,480
Accumulated deficit (99,828,367) (98,130,702)
Total shareholders' equity 11,001,058 12,082,170
Total liabilities and shareholders' equity $ 11,389,874 $ 12,564,854