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Goodwill and Long-Lived Assets (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Apr. 04, 2015
Jan. 03, 2015
Goodwill [Line Items]    
Balance as of January 3, 2015 $ 8,015us-gaap_Goodwill $ 8,015us-gaap_Goodwill
Changes in foreign currency exchange rates (198)us-gaap_GoodwillTranslationAdjustments  
Balance as of April 4, 2015 7,817us-gaap_Goodwill 8,015us-gaap_Goodwill
North America [Member]    
Goodwill [Line Items]    
Balance as of January 3, 2015 3,947us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_NorthAmericaMember
 
Changes in foreign currency exchange rates 0us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_NorthAmericaMember
 
Balance as of April 4, 2015 3,947us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_NorthAmericaMember
 
EMEA [Member]    
Goodwill [Line Items]    
Balance as of January 3, 2015 4,068us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= crtn_EmeaMember
 
Changes in foreign currency exchange rates (198)us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= crtn_EmeaMember
 
Balance as of April 4, 2015 $ 3,870us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= crtn_EmeaMember