STATEMENTS OF CASH FLOWS (Unaudited) (USD $)	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Cash flows from operating activities:
Net loss	$ (6,186,241)	$ (3,764,283)
Non-cash items included in net loss:
Depreciation and amortization	53,955	43,245
Change in fair value of common stock warrant liability	(77,600)	(168,311)
Stock-based compensation	305,127	326,877
Shares issued out of treasury	50,384	13,708
Change in deferred rent liability	65,467	0
Non cash dividend expense on preferred stock	0	281,878
Net changes in:
Other current assets	(216,934)	(1,172,780)
Accounts payable	(301,358)	(1,231,782)
Other accrued liabilities	579,323	1,298,910
Net cash used in operating activities:	(5,727,877)	(4,372,538)
Cash flows from investing activities:
Purchases of investment securities	(10,309,461)	0
Proceeds from sale and maturity of investment securities	5,237,504	301,633
Purchases of property and equipment	(177,600)	(447)
Net cash (used in) provided by investing activities	(5,249,557)	301,186
Cash flows from financing activities:
Proceeds from sale of 8% Series A Redeemable, Convertible Preferred Stock, net of issuance costs	0	4,324,080
Proceeds from sale of common stock equity, net of issuance costs	0	602,263
Principal payments on note payable	(46,341)	(29,369)
Net cash (used in) provided by financing activities	(46,341)	4,896,974
(Decrease) increase in cash and cash equivalents	(11,023,775)	825,622
Cash and cash equivalents at beginning of period	20,145,854	1,138,916
Cash and cash equivalents at end of period	9,122,079	1,964,538
Supplemental disclosures of cash flow information:
Interest and preferred stock dividends paid	$ 5,701	$ 87,264