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Business Segment, Geographic and Quarterly Financial Data - Operations by Geographic Area (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Revenues: |  |  |
Revenues | $ 79,017 us-gaap_Revenues | $ 109,338 us-gaap_Revenues | $ 97,644 us-gaap_Revenues
Assets |  |  |
Assets: | 91,471 us-gaap_NoncurrentAssets | 110,058 us-gaap_NoncurrentAssets |
United States |  |  |
Revenues: |  |  |
Revenues | 50,901 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_US | 63,275 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_US | 70,425 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_US
Assets |  |  |
Assets: | 64,324 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_US | 83,464 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_US |
Foreign |  |  |
Revenues: |  |  |
Revenues | 28,116 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = us-gaap_ForeignCountryMember | 46,063 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = us-gaap_ForeignCountryMember | 27,219 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = us-gaap_ForeignCountryMember
Assets |  |  |
Assets: | $ 27,147 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = us-gaap_ForeignCountryMember | $ 26,594 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = us-gaap_ForeignCountryMember |

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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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