Consolidated Balance Sheets (USD $)	Sep. 30, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 15,549,609	$ 4,363,712
Restricted cash	634,750	547,883
Prepaid expenses	126,259	104,022
Total current assets	16,310,618	5,015,617
Property and equipment, net	2,024,524	520,482
Other assets	153,014	166,139
Total assets	18,488,156	5,702,238
Current liabilities:
Accounts payable	1,141,267	567,195
Loan payable-current portion	106,911	50,578
Capital lease payable-current portion	37,353	30,724
Derivative warrant liability	10,800,855	35,473,230
Accrued expenses	761,939	618,369
Total current liabilities	12,848,325	36,740,096
Loan payable-less current portion	139,750	83,794
Capital lease payable-less current portion	11,119	38,042
Total liabilities	12,999,194	36,861,932
Commitments and contingencies
Stockholders' equity (deficit)
Common stock, $0.00001 par value, authorized 200,000,000 shares at September 30, 2012 and December?31, 2011; issued and outstanding 65,635,400 and 53,760,471 shares at september 30, 2012 and December?31, 2011, respectively.	656	538
Additional paid-in capital	39,925,749	16,656,830
Deficit accumulated during the development stage	(34,437,443)	(47,817,062)
Total stockholders' equity (deficit)	5,488,962	(31,159,694)
Total liabilities and stockholders' equity (deficit)	$ 18,488,156	$ 5,702,238