Income tax disclosure.

No definition available.

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- Definition

Operating loss carryforward, expiration year.

+ References

No definition available.

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- Definition

Tax credit carryforward, expiration year.

+ References

No definition available.

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 20
-Section 45
-Paragraph 11
-Subparagraph (a)-(g)
-URI http://asc.fasb.org/extlink&oid=18498875&loc=d3e39076-109324

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a),(b)
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Income Tax Expense (or Benefit)
-URI http://asc.fasb.org/extlink&oid=6515339

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- Definition

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

+ References

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Carryforwards
-URI http://asc.fasb.org/extlink&oid=6506874

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Unrecognized Tax Benefit
-URI http://asc.fasb.org/extlink&oid=6527854

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319

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- Definition

Amount of interest expense for an underpayment of income taxes.

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- Definition

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

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- Definition

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 45
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e32123-109318

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Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Line Items]
Income tax expense	$ 0	$ 0	$ 0
Increase (decrease) in valuation allowance	36,200,000	27,800,000	22,500,000
Amount of valuation allowance for deferred tax assets allocated to contributed capital	300,000
Unrecognized tax benefits	2,426,000	$ 2,426,000	$ 0
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	$ 582,800,000
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	2035
Federal \| Research And Development Tax Credits
Income Tax Disclosure [Line Items]
Tax credit carryforward amount	$ 19,100,000
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	2035
California State
Income Tax Disclosure [Line Items]
Net operating loss carryforwards	$ 192,900,000
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	2035
California State \| Research And Development Tax Credits
Income Tax Disclosure [Line Items]
Tax credit carryforward amount	$ 14,000,000
Foreign
Income Tax Disclosure [Line Items]
Net operating loss carryforwards	$ 18,800,000