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Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Income Tax Disclosure [Line Items] |  |  |
Income tax expense |  |  |
Increase (decrease) in valuation allowance | 22.5 | 22.0 | 18.1
Amount of valuation allowance for deferred tax assets allocated to contributed capital | 0.3 |  |
Federal |  |  |
Income Tax Disclosure [Line Items] |  |  |
Net operating loss carryforwards | 384.1 |  |
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 |  |  |
Income Tax Disclosure [Line Items] |  |  |
Tax credit carryforward amount | 13.8 |  |
Federal | Research And Development | Minimum |  |  |
Income Tax Disclosure [Line Items] |  |  |
Tax credit carryforward amount, expiration year | 2018 |  |
Federal | Research And Development | Maximum |  |  |
Income Tax Disclosure [Line Items] |  |  |
Tax credit carryforward amount, expiration year | 2033 |  |
California State |  |  |
Income Tax Disclosure [Line Items] |  |  |
Net operating loss carryforwards | 219.7 |  |
California State | Minimum |  |  |
Income Tax Disclosure [Line Items] |  |  |
Net operating loss carryforwards, expiration year | 2013 |  |
California State | Maximum |  |  |
Income Tax Disclosure [Line Items] |  |  |
Net operating loss carryforwards, expiration year | 2033 |  |
California State | Research And Development |  |  |
Income Tax Disclosure [Line Items] |  |  |
Tax credit carryforward amount | 11.5 |  |
Foreign |  |  |
Income Tax Disclosure [Line Items] |  |  |
Net operating loss carryforwards | $ 27.8 |  |

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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 10 -Section 50 -Paragraph 3 -Subparagraph (b) -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 -Topic 740 -SubTopic 20 -Section 45 -Paragraph 11 -Subparagraph (a)-(g) -URI http://asc.fasb.org/extlink&oid=18498875&loc=d3e39076-109324 + Details
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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 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 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 Reference 4: 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 + Details
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- Definition Amount of operating loss 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 + Details
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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 + Details
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- Definition The amount of the change in the period 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=21917399&loc=d3e32123-109318 + Details
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