STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands, except Share data	Total	Common Stock	Additional Paid-in Capital	Notes Receivable From Former Directors	Accumulated Deficit	Treasury Stock	Accumulated Other Comprehensive Income
Balance at Dec. 31, 2009	$ 69,952	$ 1,007	$ 346,731	$ (1,572)	$ (274,584)	$ (2,450)	$ 820
Balance, shares at Dec. 31, 2009		100,717,890
Non-cash compensation cost for stock options and restricted stock	1,339		1,339
Exercise of stock options	426	3	423
Exercise of stock options, shares		261,942
Restricted stock issued as compensation		1	(1)
Restricted stock issued as compensation, shares		75,000
Restricted stock cancelled		(1)	1
Restricted stock cancelled, shares		(76,667)
Issuance of common stock		105	22,984
Issuance of common stock, shares	10,513,849	10,513,849
Change in unrealized gain on investments available-for-sale	(48)						(48)
Net loss	(35,708)				(35,708)
Balance at Dec. 31, 2010	59,050	1,115	371,477	(1,572)	(310,292)	(2,450)	772
Balance, shares at Dec. 31, 2010		111,492,014
Non-cash compensation cost for stock options and restricted stock	2,047		2,047
Exercise of stock options	179	2	177
Exercise of stock options, shares		198,679
Restricted stock issued as compensation		1	(1)
Restricted stock issued as compensation, shares		50,000
Cancellation of common stock issued to former directors	50	(3)	(1,519)	1,572
Cancellation of common stock issued to former directors, shares		(261,667)
Issuance of common stock		60	11,767
Issuance of common stock, shares	6,001,841	6,001,841
Change in unrealized gain on investments available-for-sale	60						60
Net loss	(19,364)				(19,364)
Balance at Dec. 31, 2011	53,849	1,175	383,948		(329,656)	(2,450)	832
Balance, shares at Dec. 31, 2011		117,480,867
Non-cash compensation cost for stock options and restricted stock	2,091		2,091
Exercise of stock options	54	1	53
Exercise of stock options, shares		90,534
Issuance of common stock	53,155	308	52,847
Issuance of common stock, shares	8,442,025	30,827,346
Change in unrealized gain on investments available-for-sale	(402)						(402)
Net loss	(28,507)				(28,507)
Balance at Dec. 31, 2012	$ 80,240	$ 1,484	$ 438,939		$ (358,163)	$ (2,450)	$ 430
Balance, shares at Dec. 31, 2012		148,398,747