Consolidated Statements of Cash Flows (USD $)	12 Months Ended		85 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012
Cash flows from operating activities:
Net income (loss)	$ 4,663,681	$ (34,728,215)	$ (43,153,133)
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Depreciation and amortization expense	366,893	144,662	604,520
Non-cash derivative (gain) losses	(17,479,674)	26,065,579	12,538,487
Non-cash interest expense	21,870		984,704
Common stock issued to 401(k) plan	91,524	41,662	133,186
Common stock issued for services	24,750	209,451	234,201
Share-based compensation expense	1,232,959	921,512	3,033,311
Changes in operating assets and liabilities:
Restricted cash	(53,468)	(547,883)	(601,351)
Prepaid expenses and other current assets	(60,575)	(12,805)	(154,546)
Other assets		(125,000)	(200,000)
Accounts payable	585,355	230,250	1,152,550
Accrued interest payable			(15,256)
Accrued expenses	402,906	370,822	1,021,275
Net cash used in operating activities	(10,203,779)	(7,429,965)	(24,422,052)
Cash flows from investing activities:
Purchases of property and equipment	(2,140,853)	(278,923)	(2,771,561)
Net cash used in investing activities	(2,140,853)	(278,923)	(2,771,561)
Cash flows from financing activities :
Proceeds from issuance of convertible notes payable			4,181,000
Proceeds from convertible bridge notes			500,000
Principle payments on capital lease obligation	(33,361)	(24,774)	(58,135)
Proceeds from loans payable	1,747,000	151,733	1,898,733
Repayment of loans payable	(303,372)	(17,361)	(320,733)
Proceeds from issuance of common stock and warrants	19,395,743	2,998,808	33,817,838
Net cash provided by financing activities	20,806,010	3,108,406	40,018,703
Increase (Decrease) in cash and cash equivalents	8,461,378	(4,600,482)	12,825,090
Cash and cash equivalents at beginning of period	4,363,712	8,964,194
Cash and cash equivalents at end of period	12,825,090	4,363,712	12,825,090
Supplemental disclosure of cash flow information and non-cash transactions:
Cash paid for interest	49,862	8,530	155,909
Conversion of convertible notes payable and accrued interest into common stock			4,672,484
Conversion of convertible bridge note payable and accrued interest into common stock			504,597
Asset acquired through capital lease obligation		93,540	93,540
Beneficial conversion feature on convertible and bridge notes payable			134,410
Fair value of warrants issued with bridge notes payable			178,726
Fair value of warrants issued in connection with loan agreement	31,916	10,051	41,967
Issuance of founders shares			248
Reclassification of derivative warrant liability to additional paid-in capital	$ 3,408,738	$ 1,239,539	$ 4,648,277