v2.4.1.9

SEGMENT AND GEOGRAPHIC INFORMATION (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Revenue	$ 50,260us-gaap_Revenues	$ 69,391us-gaap_Revenues	$ 54,329us-gaap_Revenues
Gross profit	4,066us-gaap_GrossProfit	21,426us-gaap_GrossProfit	19,222us-gaap_GrossProfit
MMP SoC for portable media players [Member]
Segment Reporting Information [Line Items]
Revenue	50,143us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = acts_SegmentOneMember	69,256us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = acts_SegmentOneMember	54,150us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = acts_SegmentOneMember
Gross profit	3,995us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = acts_SegmentOneMember	21,349us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = acts_SegmentOneMember	19,143us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = acts_SegmentOneMember
Testing solutions [Member]
Segment Reporting Information [Line Items]
Revenue	117us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = acts_SegmentTwoMember	135us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = acts_SegmentTwoMember	179us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = acts_SegmentTwoMember
Gross profit	$ 71us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = acts_SegmentTwoMember	$ 77us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = acts_SegmentTwoMember	$ 79us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = acts_SegmentTwoMember

X

- Definition

Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1,2)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

+ Details

Name:	us-gaap_GrossProfit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	us-gaap_SegmentReportingInformationLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=acts_SegmentOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=acts_SegmentTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: