STATEMENTS OF CASH FLOWS (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Cash flows from operating activities:
Net loss	$ (23,222,678)	$ (18,818,435)
Non-cash items included in net loss:
Depreciation and amortization	169,358	165,480
Change in fair value of common stock warrant liability	(81,733)	(573,760)
Stock based compensation - options	1,036,337	1,295,382
Stock based compensation - restricted stock	171,549	357,678
Shares issued out of treasury	60,360	0
Amortization of patent license fee	7,500	7,500
Shares issued in exchange for services	71,550	18,060
Change in deferred rent liability	65,467	0
Net changes in:
Refundable income taxes	0	806,255
Prepaid expenses and other	(393,676)	340,837
Deposits and other assets	4,167	20,286
Accounts payable	(538,383)	2,357,629
Other accrued liabilities	(92,255)	655,699
Net cash used in operating activities	(22,742,437)	(13,367,389)
Cash flows from investing activities:
Purchases of investment securities	(10,659,238)	(11,844,356)
Proceeds from sale and maturity of investment securities	395,556	17,057,726
Security deposit on letter of credit	(250,000)	0
Purchases of property and equipment	(573,406)	(6,745)
Net cash (used in) provided by investing activities	(11,087,088)	5,206,625
Cash flows from financing activities:
Proceeds from sale of 8% Series A Redeemable, Convertible Preferred Stock, net of issuance costs	4,324,080	0
Proceeds from sale of equity, net of issuance costs	48,082,025	2,484,536
Proceeds from exercise of common stock warrants	428,337	0
Proceeds from note payable	144,448	0
Principal payments on note payable	(142,427)	(108,332)
Net cash provided by financing activities	52,836,463	2,376,204
Increase in cash and cash equivalents	19,006,938	(5,784,560)
Cash and cash equivalents at beginning of period	1,138,916	6,923,476
Cash and cash equivalents at end of period	20,145,854	1,138,916
Cash paid for:
Interest	501,855	31,517
Income taxes	$ 0	$ 0