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Significant Component Of Deferred Tax Assets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Deferred Income Tax Asset [Line Items]
Net operating losses	$ 26,699	$ 27,135	$ 25,235
Research and other credits	2,029	2,014	1,683
Deferred revenue	1,559
Other	750	1,051	722
Total deferred tax assets	31,037	30,200	27,640
Valuation allowance	(31,037)	(30,200)	(27,640)
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.