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Significant Components Of Deferred Tax Assets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Deferred Tax Assets:
Net operating Losses	$ 37,162	$ 26,699
Research & Other Credits	2,008	2,029
Deferred Revenue		1,559
Other	1,030	750
Total Deferred Tax Assets	40,200	31,037
Valuation Allowance	(40,200)	(31,037)
Net Deferred Tax Assets

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from deferred income.

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

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

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