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Consolidated Balance Sheets (USD $)
Jun. 30, 2011
Dec. 31, 2010
Assets    
Cash and cash equivalents $ 3,525,341 $ 6,957,544
Short term investments 2,000,000 0
Royalty receivables, net of reserves of $92,723 and $162,723 110,156 380,177
Prepaid expenses and other current assets 113,771 118,099
Note receivable SPD Control Systems 150,000 0
Total current assets 5,899,268 7,455,820
Fixed assets, net 96,014 109,768
Note receivable SPD Control Systems 0 150,000
Deposits and other assets 22,605 69,103
Total assets 6,017,887 7,784,691
Liabilities and Shareholders' Equity    
Accounts payable 75,590 51,938
Deferred revenue 189,885 25,000
Accrued expenses and other 131,059 235,301
Total liabilities 396,534 312,239
Commitments and Contingencies    
Shareholders' equity:    
Capital stock, par value $0.0001 per share; authorized 100,000,000 shares, issued and outstanding 18,544,355 and 18,281,973 shares, respectively 1,854 1,828
Additional paid-in capital 88,402,120 87,744,842
Accumulated deficit (82,782,621) (80,274,218)
Total shareholders' equity 5,621,353 7,472,452
Total liabilities and shareholders' equity $ 6,017,887 $ 7,784,691