CONDENSED STATEMENTS OF CASH FLOWS (Unaudited) (USD $)	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash flows from operating activities:
Net loss	$ (10,287,251)	$ (23,397,354)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	59,226	52,875
Retirement of fixed assets	0	4,360
Stock compensation and warrant expense	762,748	858,937
Fair value adjustment on warrant liability	(838,487)	12,416,358
Net foreign exchange gain	(138,709)	0
Changes in assets and liabilities:
Receivables	(101,824)	154,946
Interest receivable	(29,934)	19,105
Prepaid expenses and other current assets	631,137	102,323
Accounts payable	(278,151)	93,663
Accrued expenses and other current liabilities	(139,290)	616,083
Net cash used in operating activities	(10,360,535)	(9,078,704)
Cash flows from investing activities:
Proceeds from sale of short-term investments	7,000,000	2,989,902
Purchases of equipment and furnishings	(4,000)	(47,979)
Net cash provided by investing activities	6,996,000	2,941,923
Cash flows from financing activities:
Net proceeds from exercise of stock options	933	7,200
Net cash provided by financing activities	933	7,200
Net decrease in cash and cash equivalents	(3,363,602)	(6,129,581)
Cash and cash equivalents at beginning of period	14,344,088	17,988,590
Cash and cash equivalents at end of period	10,980,486	11,859,009
Supplemental disclosure of cash flow information:
Equipment and furnishings purchased on credit	1,529	64,022
Repurchase of Company's own stock for treasury	56,580	0
Cash paid for income taxes	$ 5,600	$ 82,110