Deferred Tax Asset Increase Decrease in Equity

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- Definition

Net Operating Loss Carryforward Annual Limitation

+ References

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Net Operating Loss Carryforwards Begins To Expire

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- Definition

Operating Loss Carryforwards Subject To Limitation

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- Definition

Research and Development Credits, Begin to Expire

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible domestic operating loss carryforwards. Excludes state and local operating loss carryforwards.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 6

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 25

-Paragraph 20

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards that are not subject to expiration dates.

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No definition available.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible state and local operating loss carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards that are subject to expiration dates.

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No definition available.

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- Definition

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

+ References

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 $)	1 Months Ended	12 Months Ended
Income Taxes - Additional Information (Detail) (USD $)	Aug. 31, 2004	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Taxes [Line Items]
Amount Equity would be increased		$ 18,300,000
Change in the valuation allowance		65,500,000	66,800,000	60,700,000
Federal operating loss carryforwards		1,800,000,000
State operating loss carryforwards		1,400,000,000
Net operating loss carryforwards	216,000,000
Net operating loss and credit carryforwards, annual use limitation	13,000,000
Federal
Income Taxes [Line Items]
Net operating loss carry-forwards, expiration year		2018
Research and development credits subject to expiration		48,000,000
Federal research and development credits begin to expire		2024
State
Income Taxes [Line Items]
Net operating loss carry-forwards, expiration year		2015
Research and development credits not subject to expiration		$ 39,000,000