BALANCE SHEETS (Unaudited) (USD $)	Jun. 30, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 5,380,068	$ 1,138,916
Short-term investments	133,842	395,556
Prepaid expenses and other current assets	693,440	492,184
Total current assets	6,207,350	2,026,656
Property and equipment (at cost, less accumulated depreciation of $1,129,498 and $1,046,758, respectively)	479,422	378,672
Other assets:
Deferred financing fees	85,918	0
Deposits and other assets	76,796	76,796
Patent licensing fees, net	39,375	43,125
Total other assets	202,089	119,921
Total assets	6,888,861	2,525,249
Current liabilities:
Accounts payable	3,327,553	4,548,586
Other accrued liabilities	1,688,009	2,124,189
Note payable - current portion	120,152	123,465
Total current liabilities	5,135,714	6,796,240
Common stock warrant liability	665,991	248,131
Note payable - non-current portion	0	56,403
8% Series A Redeemable Convertible Preferred Stock, 100,000 shares authorized, 5,000 issued and 864 outstanding at June 30, 2011 (aggregate liquidation preference of $864,000 as of June 30, 2011) (Note 10)	597,744	0
Total liabilities	6,399,449	7,100,774
Stockholders' equity (deficit):
Common stock, $0.01 par value; 75,000,000 shares authorized; 20,451,321 and 14,091,370 shares issued and 19,705,091 and 13,331,096 shares outstanding at June 30, 2011 and December 31, 2010, respectively	204,513	140,914
Additional paid-in capital	114,957,958	99,316,859
Accumulated other comprehensive income (loss)	21,551	(18,367)
Accumulated deficit	(111,674,818)	(100,938,261)
Subtotal	3,509,204	(1,498,855)
Treasury stock, at cost (746,230 and 760,274 shares at June 30, 2011 and December 31, 2010, respectively)	(3,019,792)	(3,076,670)
Total stockholders' equity (deficit)	489,412	(4,575,525)
Total liabilities and stockholders' equity (deficit)	$ 6,888,861	$ 2,525,249