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Income Taxes - Additional Information (Detail) (USD $) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Deferred Tax Assets Liabilities [Line Items] |  |  |  |  |
Valuation allowance, deferred tax assets | $ 11,480,000 | $ 20,214,000 | $ 11,480,000 |  |
Deferred tax assets valuation allowance increase | 1,489,000 | 10,241,000 |  |  |
Amount generate in cash refund |  | 1,600,000 |  |  |
Increases in equity of realization of deferred tax assets |  | 2,804,000 |  |  |
Unremitted earnings of international subsidiaries |  | 2,810,000 |  |  |
Unrecognized deferred tax liability |  | 219,000 |  |  |
Research tax credit carryforward extension period |  | 2 years |  |  |
Federal research tax credit recorded |  | 549,000 |  |  |
Accrued interest | 1,506,000 | 2,072,000 | 1,506,000 | 1,405,000 | 1,102,000
Potential payment of interest | 177,000 | 149,000 | 177,000 |  |
Net interest (benefit) expense |  | $ (28,000) | $ 32,000 | $ 68,000 |
Minimum [Member] |  |  |  |  |
Deferred Tax Assets Liabilities [Line Items] |  |  |  |  |
Income tax examination period |  | 3 years |  |  |
Maximum [Member] |  |  |  |  |
Deferred Tax Assets Liabilities [Line Items] |  |  |  |  |
Income tax examination period |  | 7 years |  |  |
Domestic Tax Authority [Member] |  |  |  |  |
Deferred Tax Assets Liabilities [Line Items] |  |  |  |  |
Federal net operating loss carryforwards expired |  | 2033 |  |  |

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- Definition Carrying amount as of the balance sheet date of income taxes previously overpaid to tax authorities (such as U.S. Federal, state and local tax authorities) representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes. Also called income tax refund receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 8 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 5 -Subparagraph c -Article 7 + Details
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- Definition Amount of deferred tax asset, before valuation allowance, attributable to deductible other tax carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 30 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6907311&loc=d3e30536-109315 + Details
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