Annual report pursuant to Section 13 and 15(d)

Income Taxes - Components of Deferred Tax Assets (Detail)

v2.4.1.9
Income Taxes - Components of Deferred Tax Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred tax assets:    
Federal and state net operating loss carryforwards $ 71,153us-gaap_DeferredTaxAssetsOperatingLossCarryforwards $ 60,569us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Capitalized research and development 22,314us-gaap_DeferredTaxAssetsInProcessResearchAndDevelopment 22,349us-gaap_DeferredTaxAssetsInProcessResearchAndDevelopment
Federal and state tax credit carryforwards 7,083us-gaap_DeferredTaxAssetsTaxCreditCarryforwards 6,600us-gaap_DeferredTaxAssetsTaxCreditCarryforwards
Other 1,470us-gaap_DeferredTaxAssetsOther 1,313us-gaap_DeferredTaxAssetsOther
Total deferred tax assets 102,020us-gaap_DeferredTaxAssetsGross 90,831us-gaap_DeferredTaxAssetsGross
Valuation allowance (102,020)us-gaap_DeferredTaxAssetsValuationAllowance (90,831)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred tax assets $ 0us-gaap_DeferredTaxAssetsNet $ 0us-gaap_DeferredTaxAssetsNet