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INCOME TAXES - Principal components of deferred tax assets (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Federal net operating loss carryforwards		$ 17,041
Research and development and other tax credit carryforwards	27	18,807
State net operating loss carryforwards		465
Capitalized research and development costs	817	1,651
Other	916	2,512
Total	1,760	40,476
Less valuation allowance		(40,476)
Deferred tax assets, net	$ 1,760

- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible domestic operating loss carryforwards. Excludes state and local operating loss carryforwards.

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- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible state and local operating loss carryforwards.

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- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to other deductible tax carryforwards not separately disclosed.

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- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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