v2.4.1.9

ACQUIRED INTANGIBLE ASSETS, NET (Schedule of Acquired Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	$ 31,808us-gaap_FiniteLivedIntangibleAssetsGross	$ 27,287us-gaap_FiniteLivedIntangibleAssetsGross
Less: Accumulated amortization	(14,529)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization	(15,069)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Impairment loss recognized	(820)acts_ImpairmentOfIntangibleAssetFiniteLived
IPR&D not subject to amortization	420us-gaap_OtherIndefiniteLivedIntangibleAssets	420us-gaap_OtherIndefiniteLivedIntangibleAssets
Less: Impairment loss in respect of IPR&D recognized	(420)acts_ImpairmentOfIntangibleAssetsIndefiniteLived	(420)acts_ImpairmentOfIntangibleAssetsIndefiniteLived
Acquired intangible assets, net	16,459us-gaap_IntangibleAssetsNetExcludingGoodwill	12,218us-gaap_IntangibleAssetsNetExcludingGoodwill
Purchased software [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	8,654us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_ComputerSoftwareIntangibleAssetMember	9,647us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_ComputerSoftwareIntangibleAssetMember
Less: Accumulated amortization	(6,961)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_ComputerSoftwareIntangibleAssetMember	(7,054)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_ComputerSoftwareIntangibleAssetMember
Impairment loss recognized	(168)acts_ImpairmentOfIntangibleAssetFiniteLived / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_ComputerSoftwareIntangibleAssetMember
Technology licenses [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	23,154us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember	17,640us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember
Less: Accumulated amortization	(7,568)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember	(8,015)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember
Impairment loss recognized	$ (652)acts_ImpairmentOfIntangibleAssetFiniteLived / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember

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+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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