Condensed Consolidated Balance Sheets (Unaudited) - USD ($)	Jun. 30, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 29,929,140	$ 24,987,603
Trade receivables	2,743	159,466
Other receivables	185,738	256,166
Prepaid assets	874,303	1,017,726
Deferred financing costs, current	8,763	22,082
Other assets, current	25,166	64,928
Total current assets	31,025,853	26,507,971
Property, plant and equipment, net	5,266,367	5,186,958
Other intangible assets, net	315,166	356,889
Deferred financing costs, non-current		1,224
Other assets, non-current	373,717	373,717
Total assets	36,981,103	32,426,759
Current liabilities:
Accounts payable	1,376,605	1,818,831
Accrued expenses and other current liabilities	4,622,722	4,869,710
Loan payable net of discount, current	3,466,377	4,686,388
Deferred revenue, current	16,826	16,826
Capital lease obligation, current	24,932	20,191
Deferred rent, current	111,656	85,925
Total current liabilities	9,619,118	11,497,871
Capital lease obligations, non-current	20,362	9,230
Loan payable net of discount, non-current	8,916,641	10,334,029
Fair value of warrant liability	1,043,514	1,684,551
Deferred rent, non-current	1,684,717	1,734,214
Deferred revenue, non-current	37,671	46,084
Other long-term liabilities	399,370	1,250,007
Total liabilities	$ 21,721,393	$ 26,555,986
Commitments and contingencies (Note 7)
Stockholders' equity:
Common stock, $0.01 par value; 225,000,000 shares authorized; issued and outstanding 108,133,332 at June 30, 2015 and 68,729,774 at December 31, 2014	$ 1,081,333	$ 687,298
Additional paid-in capital	452,212,600	425,389,693
Accumulated deficit	(438,084,023)	(420,271,608)
Accumulated other comprehensive income	49,800	65,390
Total stockholders' equity	15,259,710	5,870,773
Total liabilities and stockholders' equity	$ 36,981,103	$ 32,426,759