Condensed Balance Sheets (USD $)	Mar. 31, 2013	Dec. 31, 2012
CURRENT ASSETS
Cash and cash equivalents	$ 29,388,772	$ 34,794,341
Restricted cash	2,260,100
Prepaid expenses and other assets	277,874	378,803
TOTAL CURRENT ASSETS	31,926,746	35,173,144
PROPERTY AND EQUIPMENT, NET		166,386
OTHER ASSETS
Investments	3,413,762	3,413,762
Deposits	15,878	15,878
TOTAL ASSETS	35,356,386	38,769,170
CURRENT LIABILITIES
Accounts payable	164,352	1,128,644
Accrued compensation	879,385	1,078,683
Other accrued expenses	112,784	502,452
Current portion of convertible senior notes	8,169,215	7,883,886
TOTAL LIABILITIES	9,325,736	10,593,665
Capital stock
Capital stock	273,278,186	273,132,392
Accumulated deficit	(247,247,536)	(244,956,887)
TOTAL STOCKHOLDERS' EQUITY	26,030,650	28,175,505
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	35,356,386	38,769,170
Class C special stock
Capital stock
Capital stock	391	391
Common stock
Capital stock
Capital stock	$ 273,277,795	$ 273,132,001