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
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Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, gross | $ 31,808 us-gaap_FiniteLivedIntangibleAssetsGross | $ 27,287 us-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 | 420 us-gaap_OtherIndefiniteLivedIntangibleAssets | 420 us-gaap_OtherIndefiniteLivedIntangibleAssets
Less: Impairment loss in respect of IPR&D recognized | (420)acts_ImpairmentOfIntangibleAssetsIndefiniteLived | (420)acts_ImpairmentOfIntangibleAssetsIndefiniteLived
Acquired intangible assets, net | 16,459 us-gaap_IntangibleAssetsNetExcludingGoodwill | 12,218 us-gaap_IntangibleAssetsNetExcludingGoodwill
Purchased software [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, gross | 8,654 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_ComputerSoftwareIntangibleAssetMember | 9,647 us-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 | 23,154 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember | 17,640 us-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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