STOCKHOLDERS' EQUITY (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Shares Available For Grant
Balance at the beginning of the period (in shares)	14,473,498
Options granted (in shares)	(7,532,500)
Awards granted (in shares)	(79,679)
Options canceled/forfeited (in shares)	4,076,125
Awards canceled/repurchased (in shares)	2,620,327
Balance at the end of the period (in shares)	13,557,771	14,473,498
Number of Shares
Balance at the beginning of the period (in shares)	14,355,548
Options granted (in shares)	7,532,500
Options exercised (in shares)	(417)
Options canceled/forfeited (in shares)	(4,076,125)
Balance at the end of the period (in shares)	17,811,506	14,355,548
Options exercisable at the end of the period (in shares)	10,410,194	10,109,076	9,706,299
Options fully vested and expected to vest at the end of the period (in shares)	17,160,377
Weighted Average Exercise Price Per Share
Balance at the beginning of the period (in dollars per share)	$ 5.51
Options granted (in dollars per share)	$ 1.51
Options exercised (in dollars per share)	$ 1.41
Options canceled/forfeited (in dollars per share)	$ 4.50
Balance at the end of the period (in dollars per share)	$ 4.05	$ 5.51
Options exercisable at the end of the period (in dollars per share)	$ 5.49	$ 6.02	$ 6.99
Options fully vested and expected to vest at the end of the period (in dollars per share)	$ 4.13
Weighted Average Remaining Contractual Life (In years)
Balance at the end of the period	5 years 9 months 25 days
Options exercisable at the end of the period	3 years 5 months 12 days
Options fully vested and expected to vest at the end of the period	5 years 8 months 8 days
Aggregate Intrinsic Value
Balance at the end of the period (in dollars)	$ 2,000	$ 1,000
Options fully vested and expected to vest at the end of the period (in dollars)	2,000
Closing stock price (in dollars per share)	$ 1.41
Total pretax intrinsic value of stock options exercised (in dollars)	100	56,000	110,000
Cash received from exercise of options (in dollars)	$ 1,000	$ 184,000	$ 268,000
1992 Plan
STOCKHOLDERS' EQUITY
Vesting period for specific portion of options	6 months
Expiration term of options from date of grant	10 years
1992 Plan | Minimum
STOCKHOLDERS' EQUITY
Option vesting period	4 years
1992 Plan | Maximum
STOCKHOLDERS' EQUITY
Option vesting period	5 years
2002 Plan
STOCKHOLDERS' EQUITY
Option vesting period	4 years
Vesting period for specific portion of options	6 months
Expiration term of options from date of grant	10 years
Exercise price of options as a percentage of fair market value	100.00%
2011 Plan
STOCKHOLDERS' EQUITY
Option vesting period	4 years
Vesting period for specific portion of options	6 months
Expiration term of options from date of grant	10 years
Exercise price of options as a percentage of fair market value	100.00%
Shares of common stock reserved for issuance	12,700,000
Minimum percentage of ownership required for granting options at least 110% of fair market value of common stock	10.00%
Minimum exercise price as a percentage of fair market value for employees having more than 10 % outstanding common stock	110.00%
Maximum expiration term of options granted to employees having more than 10 % outstanding common stock	5 years
1996 Directors Plan
STOCKHOLDERS' EQUITY
Expiration term of options from date of grant	10 years
Percentage of option vesting	100.00%
1996 Directors Plan | First Option
STOCKHOLDERS' EQUITY
Option vesting period	3 years
2006 Directors Plan
STOCKHOLDERS' EQUITY
Exercise price of options as a percentage of fair market value	100.00%
Shares of common stock reserved for issuance	850,000
2006 Directors Plan | First Director Option
STOCKHOLDERS' EQUITY
Option vesting period	3 years
Options to be granted to purchase shares upon appointment (in shares)	70,000
2006 Directors Plan | Subsequent Director Option
STOCKHOLDERS' EQUITY
Option vesting period	1 year
Options to be granted to purchase shares (in shares)	35,000