Income tax disclosure.

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Operating loss carryforward, expiration year.

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Tax credit carryforward, expiration year.

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Tax cuts and jobs act of 2017, change in tax rate, deferred tax assets net.

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Tax cuts and jobs act of 2017, change in tax rate, deferred tax assets valuation allowance.

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Tax cuts and jobs act of 2017, change in tax rate, undistributed accumulated earnings of foreign subsidiary.

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- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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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.

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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
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Line Items]
Income tax expense		$ 0	$ 0	$ 0
Increase (decrease) in valuation allowance		$ (108,800,000)	36,400,000	$ 36,200,000
Federal corporate income tax rate		35.00%
Tax act, net deferred tax assets		$ 87,000,000
Tax act, deferred tax assets valuation allowance		87,000,000
Tax act, repatriation of undistributed earnings and profits of U.S. owned foreign corporations		700,000
Unrecognized tax benefits		1,229,000	$ 2,426,000
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		$ 629,100,000
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		2037
Federal \| Research And Development Tax Credits
Income Tax Disclosure [Line Items]
Tax credit carryforward amount		$ 16,900,000
Federal \| Research And Development Tax Credits \| Minimum
Income Tax Disclosure [Line Items]
Tax credit carryforward amount, expiration year		2018
Federal \| Research And Development Tax Credits \| Maximum
Income Tax Disclosure [Line Items]
Tax credit carryforward amount, expiration year		2037
California and Other States
Income Tax Disclosure [Line Items]
Net operating loss carryforwards		$ 168,400,000
California and Other States \| Minimum
Income Tax Disclosure [Line Items]
Net operating loss carryforwards, expiration year		2026
California and Other States \| Maximum
Income Tax Disclosure [Line Items]
Net operating loss carryforwards, expiration year		2037
California State \| Research And Development Tax Credits
Income Tax Disclosure [Line Items]
Tax credit carryforward amount		$ 17,400,000
Foreign
Income Tax Disclosure [Line Items]
Net operating loss carryforwards		$ 15,500,000
New Corporate Tax Rate
Income Tax Disclosure [Line Items]
Federal corporate income tax rate	21.00%