Consolidated Balance Sheets (USD $)	Dec. 31, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 4,363,712	$ 8,964,194
Restricted cash	547,883
Prepaid expenses	104,022	81,166
Total current assets	5,015,617	9,045,360
Property and equipment, net	520,482	280,181
Other assets	166,139	53,639
Total assets	5,702,238	9,379,180
Current liabilities:
Accounts payable	567,195	336,945
Loan payable-current portion	50,578
Capital lease payable-current portion	30,724
Derivative warrant liability	35,473,230	10,647,190
Accrued expenses	618,369	247,547
Total current liabilities	36,740,096	11,231,682
Loan payable-less current portion	83,794
Capital lease payable-less current portion	38,042
Total liabilities	36,861,932	11,231,682
Commitments and contingencies
Stockholders' deficit:
Common stock, $0.00001 par value, authorized 200,000,000 and 100,000,000 shares at December 31, 2011 and December 31, 2010, respectively; issued and outstanding 53,760,471 and 51,647,171 shares at December 31, 2011 and 2010, respectively.	538	516
Additional paid-in capital	16,656,830	11,235,829
Deficit accumulated during the development stage	(47,817,062)	(13,088,847)
Total stockholders' deficit	(31,159,694)	(1,852,502)
Total liabilities and stockholders' deficit	$ 5,702,238	$ 9,379,180