Consolidated Balance Sheets (Unaudited) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Current Assets:
Cash and cash equivalents	$ 5,170,251	$ 3,747,210
Cash restricted pursuant to letters of credit	657,463	407,463
Deferred financing costs, current portion	968,004	968,004
Prepaid expenses and other current assets	231,171	75,626
Total current assets	7,026,889	5,198,303
Property and Equipment, at cost:
Computer equipment	293,927	367,854
Office and laboratory equipment (including assets under capitalized leases)	668,094	732,296
Furniture and fixtures	734,772	728,269
Manufacturing equipment	75,993	156,435
Leasehold improvements	853,416	818,939
Property and equipment, at cost	2,626,202	2,803,793
Less-Accumulated depreciation and amortization	(947,738)	(1,165,398)
Net property and equipment (including assets under capitalized leases)	1,678,464	1,638,395
Other Assets:
Restricted cash	9,740	9,740
Intangible assets, net of accumulated amortization	9,625,000	9,625,000
Deferred financing costs, net of current portion	3,307,327	3,549,328
Other assets	826	826
Total other assets	12,942,893	13,184,894
Total assets	21,648,246	20,021,592
Current Liabilities:
Accounts payable	1,499,294	2,319,219
Deferred revenue from licensing arrangements	67,671	90,228
Capital lease obligation, current portion	2,591	2,527
Derivative warrant liability	3,904,155	5,585,141
Accrued expenses and other liabilities	1,759,537	1,581,448
Total current liabilities	7,233,248	9,578,563
Capital lease obligation, net of current portion	689	1,361
Note payable, net of discount		120,834
Deferred revenue from licensing arrangements, net of current portion	90,228	90,228
Total liabilities	7,324,165	9,790,986
Series C, $0.01 par value, authorized 10,000 shares, issued and outstanding 9,974.185 shares at March 31, 2013 and December 31, 2012	100	100
Series D, $0.01 par value, authorized 3,600,000 shares, issued and outstanding 3,006,000 shares at March 31, 2013 and December 31, 2012 (preference in liquidation of $3,006,000)	30,060	30,060
Common Stock, $0.01 par value, authorized 150,000,000 shares, issued and outstanding 60,244,669 and 44,373,461 shares at March 31, 2013 and December 31, 2012, respectively	602,449	443,737
Additional paid-in capital	114,581,812	103,658,724
Accumulated deficit	(100,890,340)	(93,902,015)
Total stockholders' equity	14,324,081	10,230,606
Total liabilities and stockholders' equity	$ 21,648,246	$ 20,021,592