INCOME TAXES (Tables)

12 Months Ended

Dec. 31, 2012

Income Tax Disclosure [Abstract]

Schedule of company's effective income tax rate

	2012			2011			2010
Income tax (benefit) expense at statutory rate	$	(3,696	)	$	(3,659	)	$	(10,430	)
State tax (benefit) expense, net of Federal tax (benefit) expense		(449	)		357			(559	)
Permanent items		648			617			116
Effect of change in valuation allowance and State NOL expiration		3,190			3,737			11,586
Tax credits		320			(2,006	)		(1,466	)
Other		(13	)		954			203
Tax expense (benefit)	$	—		$	—		$	(550	)

Schedule of company's deferred tax assets and liabilities

	2012			2011
Deferred tax assets:
Net operating loss carryforwards	$	91,118		$	86,848
Tax credit carryforwards		22,172			22,492
Equity based compensation		6,774			5,881
Book depreciation in excess of tax		2,263			2,321
Reserves and accruals		(132	)		(101	)
Deferred revenue		15,672			21,439
Loss on investment		194			194
Other		140			180
		138,201			139,254
Valuation allowance		(138,201	)		(139,254	)
Deferred tax liabilities		—			—
Net deferred tax assets	$	—		$	—