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Operating loss carryforward, expiration year.

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Tax credit carryforward, expiration year.

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The amount of the valuation allowance recorded for tax benefits that will be credited to shareholders' equity if those tax benefits subsequently become realizable. Examples include 1) adjustments of the opening balance of retained earnings for certain changes in accounting principle or a correction of an error; 2) gains and losses included in comprehensive income but excluded from net income; 3) expenditures that are deductible for income tax purposes that are reported as a reduction of shareholders' equity; 4) expenses for employee stock options recognized differently for financial reporting purposes and income tax purposes; 5) dividends paid on unallocated shares held by an ESOP that are charged to retained earnings and 6) deductible temporary differences that existed at the date of a quasi reorganization.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (b)

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

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-Publisher FASB

-Name Accounting Standards Codification

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Amount of expense for penalties related to a tax position claimed or expected to be claimed in the tax return.

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Amount of interest expense for an underpayment of income taxes.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.

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Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
Income Taxes - Additional Information (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Line Items]
Income tax expense	$ 0us-gaap_IncomeTaxExpenseBenefit	$ 0us-gaap_IncomeTaxExpenseBenefit	$ 0us-gaap_IncomeTaxExpenseBenefit
Increase (decrease) in valuation allowance	27,800,000	22,500,000	22,000,000
Amount of valuation allowance for deferred tax assets allocated to contributed capital	300,000
Unrecognized tax benefits	2,426,000us-gaap_UnrecognizedTaxBenefits
Unrecognized tax benefits would affect the effective tax rate	0
Interest related to unrecognized tax benefits	0
Penalties related to unrecognized tax benefits	0
Federal
Income Tax Disclosure [Line Items]
Net operating loss carryforwards	479,100,000
Federal \| Minimum
Income Tax Disclosure [Line Items]
Net operating loss carryforwards, expiration year	2018
Federal \| Maximum
Income Tax Disclosure [Line Items]
Net operating loss carryforwards, expiration year	2034
Federal \| Research And Development
Income Tax Disclosure [Line Items]
Tax credit carryforward amount	16,400,000
Federal \| Research And Development \| Minimum
Income Tax Disclosure [Line Items]
Tax credit carryforward amount, expiration year	2015
Federal \| Research And Development \| Maximum
Income Tax Disclosure [Line Items]
Tax credit carryforward amount, expiration year	2034
California State
Income Tax Disclosure [Line Items]
Net operating loss carryforwards	202,200,000
California State \| Minimum
Income Tax Disclosure [Line Items]
Net operating loss carryforwards, expiration year	2015
California State \| Maximum
Income Tax Disclosure [Line Items]
Net operating loss carryforwards, expiration year	2034
California State \| Research And Development
Income Tax Disclosure [Line Items]
Tax credit carryforward amount	12,700,000
Foreign
Income Tax Disclosure [Line Items]
Net operating loss carryforwards	$ 23,100,000