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Income Taxes - Additional Information (Detail) (USD $) | 3 Months Ended | 6 Months Ended | 12 Months Ended | 3 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Dec. 31, 2013 | Dec. 31, 2014 Scenario, Forecast [Member]
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Deferred tax benefits including income tax expense | $ 5,500,000 |  | $ 9,100,000 |  |  |
Valuation allowance | 88,500,000 |  | 88,500,000 |  |  |
Net deferred tax assets | 88,600,000 |  | 88,600,000 |  |  |
Income tax benefit including discrete items | 24,000 | 104,000 | 49,000 | 21,000 |  |
Internal revenue code related to annual use of operating loss carry forwards |  |  | Annual use of the Company's net operating loss and research and development credit carryforwards may be limited in the event a cumulative change in ownership of more than 50% occurs within a three-year period. |  |  |
Internal revenue code, cumulative change in ownership |  |  | 50.00% |  |  |
Uncertain income tax position unrecognized |  |  | Less than a 50% likelihood |  |  |
Total liability for unrecognized tax benefits included other long-term liabilities |  |  | 62,000 |  | 62,000 |
Interest benefit on uncertain tax positions | 0 |  | 0 |  |  |
Expected unrecognized tax benefits due to expiration of limitations applicable to the 2009 taxable year |  |  |  |  |  | $ 62,000

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- Definition Amount of other deferred income tax expense (benefit) pertaining to income (loss) from continuing operations. For example, but not limited to, acquisition-date income tax benefits or expenses recognized from changes in the acquirer's valuation allowance for its previously existing deferred tax assets resulting from a business combination and adjustments to beginning-of-year balance of a valuation allowance because of a change in circumstance causing a change in judgment about the realizability of the related deferred tax asset in future periods. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I.7) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section I -Subsection 7 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6510177 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (g),(h) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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