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Consolidated Statements of Cash Flows (USD $)
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Cash flows from operating activities:    
Net loss $ (1,592,871) $ (2,508,403)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 17,122 19,569
Stock-based compensation 581,720 591,327
Recovery of uncollectible royalty receivable 0 (30,000)
Changes in assets and liabilities:    
Royalty receivables (203,201) 300,021
Prepaid expenses and other assets 43,769 50,826
Deferred revenue 131,250 164,885
Accounts payable and accrued expenses (32,097) (80,590)
Net cash used in operating activities (990,114) (1,492,365)
Cash flows from investing activities:    
Purchase of fixed assets (4,518) (5,815)
Change in short term investments 205,056 (2,000,000)
Note receivable and interest on SPD Control Systems 224,903 0
Net cash provided by (used in) investing activities 425,441 (2,005,815)
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) increase in cash and cash equivalents (564,673) 3,432,203
Cash and cash equivalents at beginning of year 2,403,364 6,957,544
Cash and cash equivalents at end of period $ 1,838,691 $ 3,525,341