Quarterly report pursuant to Section 13 or 15(d)

Statements of Cash Flows

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Statements of Cash Flows (USD $)
 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Cash flow from operating activities:    
Net loss $ (9,018,878) $ (6,708,117)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation for services 1,227,597 706,135
Depreciation and amortization 251,900 334,715
Impairment charges 2,951 44,554
Amortization of license fee (61,612) (4,490)
Changes in:    
Accounts receivable - trade (56,068) 31,778
Prepaid expenses and other current assets 229,135 330,318
Accounts payable 256,431 60,317
Accrued compensation (409,335) 276,062
Accrued expenses 330,190 290,482
Deferred revenue 317,485 1,036,220
Net cash used in operating activities (6,930,204) (3,602,026)
Cash flows from investing activities:    
Purchases of short-term investments (17,759,448) (598,775)
Sales of short-term investments 5,989,785 1,212,733
Purchases of property and equipment (24,241) (42,024)
Purchases of patent and other assets (79,055) (59,869)
Net cash (used in) provided by investing activities (11,872,959) 512,065
Cash flows from financing activities:    
Repayment of notes payable and other obligations (789,058) (979,905)
Net proceeds from issuance of common stock 12,969,587 10,938,512
Net cash provided by financing activities 12,180,529 9,958,607
Net (decrease) increase in cash and cash equivalents (6,622,634) 6,868,646
Cash and cash equivalents at beginning of period 10,977,974 2,968,104
Cash and cash equivalents at end of period 4,355,340 9,836,750
Supplemental disclosure of cash flow information:    
Cash paid during the period for interest 110,519 187,885
Schedule of non-cash investing and financing transactions:    
Acquisitions of current assets for installment obligations $ 344,689 $ 480,635