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Consolidated Balance Sheets (USD $)
Dec. 31, 2012
Dec. 31, 2011
Assets    
Cash and cash equivalents $ 8,390,233 $ 2,403,364
Short-term investments 5,052,921 1,255,056
Royalty receivables, net of reserves of $92,723 in 2012 and 2011 688,318 334,050
Prepaid expenses and other current assets 201,949 169,634
Note receivable, SPD Control Systems 0 150,000
Total current assets 14,333,421 4,312,104
Fixed assets, net 59,041 82,428
Deposits and other assets 22,605 22,605
Total assets 14,415,067 4,417,137
Liabilities and Shareholders' Equity    
Accounts payable 72,269 96,146
Accrued expenses and other 145,123 188,793
Deferred revenue 25,000 25,000
Total current liabilities 242,392 309,939
Commitments (note 9) 0 0
Shareholders' equity:    
Common stock, par value $0.0001 per share; authorized 100,000,000 shares, issued and outstanding 22,646,782 and 18,544,355 shares for 2012 and 2011 2,265 1,854
Additional paid-in capital 101,642,297 88,513,630
Accumulated deficit (87,471,887) (84,408,286)
Total shareholders' equity 14,172,675 4,107,198
Total liabilities and shareholders' equity $ 14,415,067 $ 4,417,137