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Consolidated Balance Sheets (USD $)
Dec. 31, 2011
Dec. 31, 2010
Assets    
Cash and cash equivalents $ 2,403,364 $ 6,957,544
Short-term Investments 1,255,056 0
Royalty receivables, net of reserves of $92,723 in 2011 and $162,723 in 2010 334,050 380,177
Prepaid expenses and other current assets 169,634 118,099
Note receivable, SPD Control Systems 150,000 0
Total current assets 4,312,104 7,455,820
Fixed assets, net 82,428 109,768
Note receivable, SPD Control Systems 0 150,000
Deposits and other assets 22,605 69,103
Total assets 4,417,137 7,784,691
Liabilities and Shareholders' Equity    
Accounts payable 96,146 51,938
Accrued expenses and other 188,793 235,301
Deferred revenue 25,000 25,000
Total current liabilities 309,939 312,239
Commitments (note 9)      
Shareholders' equity:    
Common stock, par value $0.0001 per share; authorized 100,000,000 shares, issued and outstanding 18,544,355 and 18,281,973 shares for 2011 and 2010 1,854 1,828
Additional paid-in capital 88,513,630 87,744,842
Accumulated deficit (84,408,286) (80,274,218)
Total shareholders' equity 4,107,198 7,472,452
Total liabilities and shareholders' equity $ 4,417,137 $ 7,784,691