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Business Combinations and Goodwill Pro Forma Financial Information (Details) (Silicon Image, Inc, USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended
Apr. 04, 2015
Mar. 29, 2014
Silicon Image, Inc
   
Business Acquisition [Line Items]    
Total revenues $ 133,498us-gaap_BusinessAcquisitionsProFormaRevenue
/ us-gaap_BusinessAcquisitionAxis
= lscc_SiliconImageIncMember
$ 158,198us-gaap_BusinessAcquisitionsProFormaRevenue
/ us-gaap_BusinessAcquisitionAxis
= lscc_SiliconImageIncMember
Net loss attributable to common stockholders $ (48,288)us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
/ us-gaap_BusinessAcquisitionAxis
= lscc_SiliconImageIncMember
$ (28,241)us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
/ us-gaap_BusinessAcquisitionAxis
= lscc_SiliconImageIncMember
Basic net loss per share $ (0.41)us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic
/ us-gaap_BusinessAcquisitionAxis
= lscc_SiliconImageIncMember
$ (0.24)us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic
/ us-gaap_BusinessAcquisitionAxis
= lscc_SiliconImageIncMember
Diluted net loss per share $ (0.41)us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted
/ us-gaap_BusinessAcquisitionAxis
= lscc_SiliconImageIncMember
$ (0.24)us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted
/ us-gaap_BusinessAcquisitionAxis
= lscc_SiliconImageIncMember