Condensed Balance Sheets (USD $)	Jun. 30, 2012	Dec. 31, 2011
CURRENT ASSETS
Cash and cash equivalents	$ 42,417,045	$ 57,225,234
Prepaid expenses and other assets	512,640	801,147
TOTAL CURRENT ASSETS	42,929,685	58,026,381
PROPERTY AND EQUIPMENT, NET	862,439	861,364
OTHER ASSETS
Investments	3,413,762	3,405,807
Deposits	88,793	86,203
TOTAL ASSETS	47,294,679	62,379,755
CURRENT LIABILITIES
Accounts payable	3,835,756	3,150,677
Accrued compensation	1,031,624	1,597,329
Other accrued expenses	1,028,623	2,479,697
Current portion of convertible senior notes	10,477,635
TOTAL CURRENT LIABILITIES	16,373,638	7,227,703
Long-term convertible senior notes		17,336,760
TOTAL LIABILITIES	16,373,638	24,564,463
Capital stock
Capital stock	265,768,782	255,054,440
Accumulated deficit	(234,847,741)	(217,239,148)
TOTAL STOCKHOLDERS' EQUITY	30,921,041	37,815,292
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	47,294,679	62,379,755
Class C Special Shares
Capital stock
Capital stock	65	65
Common Stock
Capital stock
Capital stock	$ 265,768,717	$ 255,054,375