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Consolidated Statements of Cash Flows (USD $)
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Cash flows from operating activities:    
Net loss $ (803,339) $ (1,589,281)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 8,500 9,678
Stock-based compensation 463,881 474,978
Recovery of uncollectible royalty receivable 0 (30,000)
Changes in assets and liabilities:    
Royalty receivables (108,511) 215,408
Prepaid expenses and other assets (598,239) 25,206
Deferred revenue 162,500 224,203
Accounts payable and accrued expenses 83,641 1,360
Net cash used in operating activities (791,567) (668,448)
Cash flows from investing activities:    
Purchase of fixed assets (2,459) (2,284)
Change in short term investments (2,497) 0
Note receivable and interest on SPD Control Systems 224,903 0
Net cash provided by (used in) investing activities 219,947 (2,284)
Cash flows from financing activities:    
Net proceeds from the exercise of options or warrants 0 65,977
Net cash provided by financing activities 0 65,977
Net decrease in cash and cash equivalents (571,620) (604,755)
Cash and cash equivalents at beginning of year 2,403,364 6,957,544
Cash and cash equivalents at end of period $ 1,831,744 $ 6,352,789