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Consolidated Statements of Cash Flows (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Cash flows from operating activities:      
Net loss $ (3,063,601) $ (4,134,068) $ (3,874,865)
Adjustments to reconcile net loss to net cash used in operating activities:      
Depreciation and amortization 34,963 39,857 44,315
Stock based compensation 878,578 702,837 772,604
Recovery of uncollectible receivables 0 (70,000) [1] (23,845) [1]
Change in assets and liabilities:      
Royalty receivables (354,268) 116,127 (129,841)
Prepaid expenses and other current assets (107,218) (5,037) 20,861
Accounts payable and accrued expenses (67,547) (2,300) 3,716
Deposits and other assets 0 0 (14,998)
Net cash used in operating activities (2,679,093) (3,352,584) (3,202,053)
Cash flows from investing activities:      
Purchases of fixed assets (11,576) (12,517) (10,313)
Purchase of investments (3,797,865) (2,255,056) 0
Proceeds from sale of investment 0 1,000,000 0
Note and interest receivable on SPD Control Systems 224,903 0 0
Net cash used in investing activities (3,584,538) (1,267,573) (10,313)
Cash flows from financing activities:      
Net proceeds from issuances of common stock and exercise of options and warrants 12,250,500 65,977 6,409,376
Net cash provided by financing activities 12,250,500 65,977 6,409,376
Net increase (decrease) in cash and cash equivalents 5,986,869 (4,554,180) 3,197,010
Cash and cash equivalents at beginning of year 2,403,364 6,957,544 3,760,534
Cash and cash equivalents at end of year 8,390,233 2,403,364 6,957,544
Non Cash Financing and Investing Activities:      
Cashless Exercise of Stock Options $ 0 $ 276,750 $ 0
[1] Recovery of previously reserved receivables.