Consolidated Balance Sheets (USD $)	Dec. 31, 2013	Dec. 31, 2012
Current Assets:
Cash and cash equivalents	$ 8,055,385	$ 3,747,210
Cash restricted pursuant to letters of credit	302,488	407,463
Current portion of deferred financing costs	968,004	968,004
Prepaid expenses and other current assets	49,221	75,626
Total current assets	9,375,098	5,198,303
Property and Equipment, at cost:
Computer equipment	323,488	367,854
Office and laboratory equipment (including assets under capitalized leases)	728,152	732,296
Furniture and fixtures	755,444	728,269
Manufacturing equipment	111,980	156,435
Leasehold improvements	825,589	818,939
Property and equipment, at cost	2,744,653	2,803,793
Less-Accumulated depreciation and amortization	(1,248,846)	(1,165,398)
Net property and equipment (including assets under capitalized leases)	1,495,807	1,638,395
Other Assets:
Restricted cash	10,490	9,740
Intangible assets, net of accumulated amortization	9,625,000	9,625,000
Deferred financing costs	2,581,324	3,549,328
Other assets	1,576	826
Total other assets	12,218,390	13,184,894
Total assets	23,089,295	20,021,592
Current Liabilities:
Accounts payable	1,036,320	2,319,219
Deferred revenue from licensing arrangements, current portion	76,428	90,228
Current portion of capital lease obligation	1,361	2,527
Derivative warrant liability	1,119,155	5,585,141
Accrued expenses and other current liabilities	1,411,107	1,581,448
Total current liabilities	3,644,371	9,578,563
Capital lease obligation, net of current portion		1,361
Note payable, net of discount		120,834
Deferred revenue from licensing arrangements, net of current portion	76,428	90,228
Total liabilities	3,720,799	9,790,986
Convertible Preferred Stock:
Series C, $0.01 par value, authorized 10,000 shares, issued and outstanding 1,000 and 9,974.185 shares at December 31, 2013 and 2012, respectively	10	100
Series D, $0.01 par value, authorized 3,600,000 shares, issued and outstanding 1,000,000 and 3,006,000 shares at December 31, 2013 and 2012, respectively (preference in liquidation of $1,000,000 and $3,006,000)	10,000	30,060
Series E, $0.01 par value, authorized 1,748,613 shares, issued and outstanding 1,748,613 shares at December 31, 2013	17,486
Common stock, $0.01 par value, authorized 150,000,000 shares, issued and outstanding 11,776,578 and 4,437,346 shares at December 31, 2013 and 2012, respectively	117,764	44,374
Additional paid-in capital	132,192,648	104,058,087
Accumulated deficit	(112,969,412)	(93,902,015)
Total stockholders' equity	19,368,496	10,230,606
Total liabilities and stockholders' equity	$ 23,089,295	$ 20,021,592