INCOME TAXES (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Significant components of deferred tax assets
Net operating loss carryforwards	$ 248,700,000	$ 230,200,000
Purchased technology	20,000,000	22,200,000
Research credits	20,500,000	20,100,000
Capitalized research and development	19,400,000	19,000,000
License fees	1,100,000	1,300,000
Other - net	14,000,000	16,700,000
Total deferred tax assets	323,700,000	309,500,000
Valuation allowance for deferred tax assets	(323,700,000)	(309,500,000)
Valuation allowance
Increase in valuation allowance	14,200,000	27,300,000	42,800,000
Valuation allowance for deferred tax assets related to benefits of stock option deductions	$ 5,500,000