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Income Taxes - Additional Information (Detail) (USD $) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income Taxes [Line Items] |  |  |
Operating loss carryforwards | $ 1,387,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards | $ 883,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards |
Valuation allowance for state tax net operating losses | 108,000 us-gaap_DeferredTaxAssetsValuationAllowanceNoncurrent | 108,000 us-gaap_DeferredTaxAssetsValuationAllowanceNoncurrent |
Unrecognized tax benefits | 1,065,000 us-gaap_UnrecognizedTaxBenefits | 459,000 us-gaap_UnrecognizedTaxBenefits | 783,000 us-gaap_UnrecognizedTaxBenefits
Potential increase (decrease) in income tax provision | 700,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate | 300,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate |
Possible reduction in unrecognized tax benefits resulting from audit settlements | 300,000 us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleEstimatedRangeOfChangeLowerBound |  |
Possible increase in unrecognized tax benefits resulting from audit settlements | (300,000)us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleEstimatedRangeOfChangeUpperBound |  |
Interest expense related to income tax liabilities | 1,000 us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense |  |
Income tax penalties related to income tax liabilities | 1,000 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesExpense |  |
Proceeds from audited refund claim for tax | $ 300,000 us-gaap_ProceedsFromIncomeTaxRefunds |  |
Minimum [Member] |  |  |
Income Taxes [Line Items] |  |  |
Operating loss carryforwards, expiration date | Dec. 31, 2015 |  |
Maximum [Member] |  |  |
Income Taxes [Line Items] |  |  |
Operating loss carryforwards, expiration date | Dec. 31, 2034 |  |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible 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 + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized expected to be realized or consumed after one year (or the normal operating cycle, if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e31917-109318 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e31928-109318 + Details
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- Definition Expiration date of each operating loss carryforward included in operating loss carryforward, in CCYY-MM-DD format. + 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 cash received during the period as refunds for the overpayment of taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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