Annual report pursuant to Section 13 and 15(d)

Intangible Assets and Related Accumulated Amortization (Detail)

v2.4.1.9
Intangible Assets and Related Accumulated Amortization (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Intangible Assets And Goodwill [Line Items]    
Intangible assets, gross $ 2,800us-gaap_FiniteLivedIntangibleAssetsGross $ 2,800us-gaap_FiniteLivedIntangibleAssetsGross
Intangible assets, accumulated amortization (2,686)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization (2,617)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Intangible assets, net 114us-gaap_FiniteLivedIntangibleAssetsNet 183us-gaap_FiniteLivedIntangibleAssetsNet
Useful life Indefinite life  
Goodwill gross 2,926us-gaap_GoodwillGross 2,926us-gaap_GoodwillGross
Goodwill 2,926us-gaap_Goodwill 2,926us-gaap_Goodwill
Patents    
Intangible Assets And Goodwill [Line Items]    
Intangible assets, gross 1,914us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember
1,914us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember
Intangible assets, accumulated amortization (1,907)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember
(1,895)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember
Intangible assets, net 7us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember
19us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember
Patents | Minimum    
Intangible Assets And Goodwill [Line Items]    
Useful life 4 years  
Patents | Maximum    
Intangible Assets And Goodwill [Line Items]    
Useful life 10 years  
Trademarks    
Intangible Assets And Goodwill [Line Items]    
Useful life 6 years  
Intangible assets, gross 69us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember
69us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember
Intangible assets, accumulated amortization (69)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember
(69)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember
Other Intangible Assets    
Intangible Assets And Goodwill [Line Items]    
Intangible assets, gross 817us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember
817us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember
Intangible assets, accumulated amortization (710)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember
(653)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember
Intangible assets, net $ 107us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember
$ 164us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember
Other Intangible Assets | Minimum    
Intangible Assets And Goodwill [Line Items]    
Useful life 4 years  
Other Intangible Assets | Maximum    
Intangible Assets And Goodwill [Line Items]    
Useful life 6 years