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Statements of Cash Flows (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Cash flow from operating activities:    
Net loss $ (2,802,169) $ (1,938,271)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation for services 484,222 221,996
Depreciation and amortization 86,808 112,325
Impairment charges    41,950
Amortization of license fee (18,655)   
Changes in:    
Accounts payable 90,857 (121,135)
Accounts receivable    28,028
Prepaid expenses and other current assets 100,719 109,043
Deferred revenue 196,860   
Accrued compensation (421,183)   
Accrued expenses (189,306) (188,522)
Net cash used in operating activities (2,471,847) (1,734,586)
Cash flows from investing activities:    
Purchases of short-term investments (5,612,896)   
Sales of short-term investments    441,346
Purchases of property and equipment (10,844)   
Purchases of patent and trademark application costs (29,284) (23,099)
Net cash provided by investing activities (5,653,024) 418,247
Cash flows from financing activities:    
Repayment of notes payable and other obligations (361,265) (335,303)
Net cash provided by financing activities (361,265) (335,303)
Net decrease in cash and cash equivalents (8,486,136) (1,651,642)
Cash and cash equivalents at beginning of period 10,977,974 2,968,104
Cash and cash equivalents at end of period 2,491,838 1,316,462
Supplemental disclosure of cash flow information:    
Cash paid during the period for interest $ 47,120 $ 64,768