CONSOLIDATED STATEMENTS OF OPERATIONS (unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
Mar. 30, 2019	Mar. 31, 2018
Revenue:
Revenue	$ 98,091	$ 98,623
Costs and expenses:
Cost of product revenue	40,439	42,102
Research and development	19,665	22,941
Selling, general, and administrative	20,781	27,043
Amortization of acquired intangible assets	3,389	5,636
Restructuring charges	1,341	1,029
Acquisition related charges	0	667
Total costs and expenses	85,615	99,418
Income (loss) from operations	12,476	(795)
Interest expense	(4,987)	(5,114)
Other income, net	153	554
Income (loss) before income taxes	7,642	(5,355)
Income tax expense	234	597
Net income (loss)	$ 7,408	$ (5,952)
Net income (loss) per share:
Basic (in usd per share)	$ 0.06	$ (0.05)
Diluted (in usd per share)	$ 0.05	$ (0.05)
Shares used in per share calculations:
Basic (in shares)	130,992	124,076
Diluted (in shares)	134,810	124,076
Product
Revenue:
Revenue	$ 91,612	$ 95,109
Licensing and services
Revenue:
Revenue	$ 6,479	$ 3,514

Amortization Of Intangible Assets, Acquired

No definition available.

Name:	lscc_AmortizationOfIntangibleAssetsAcquired
Namespace Prefix:	lscc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 23
-URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e1043-128460