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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
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Revenues:      
Revenues $ 79,017us-gaap_Revenues $ 109,338us-gaap_Revenues $ 97,644us-gaap_Revenues
Assets      
Assets: 91,471us-gaap_NoncurrentAssets 110,058us-gaap_NoncurrentAssets  
United States      
Revenues:      
Revenues 50,901us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_US		 63,275us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_US		 70,425us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_US
Assets      
Assets: 64,324us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= country_US		 83,464us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= country_US		  
Foreign      
Revenues:      
Revenues 28,116us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_ForeignCountryMember		 46,063us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_ForeignCountryMember		 27,219us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_ForeignCountryMember
Assets      
Assets: $ 27,147us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= us-gaap_ForeignCountryMember		 $ 26,594us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= us-gaap_ForeignCountryMember