v2.4.1.9
SHARE-BASED COMPENSATION (Narrative) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
May 31, 2007
May 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of common shares subscribed by authorized options and RSUs       48,000,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights  
Unrecognized compensation cost related to non-vested stock options    $ 2,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions      
Unrecognized compensation cost related to non-vested RSUs 22,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions 19,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions      
Total share-based compensation expense in relation to options and RSU 45,000us-gaap_ShareBasedCompensation 492,000us-gaap_ShareBasedCompensation 1,465,000us-gaap_ShareBasedCompensation    
Milestone one 31,500,000acts_GrossMarginMilestoneOne        
Milestone two 44,500,000acts_GrossMarginMilestoneTwo        
Milestone three   $ 55,500,000acts_GrossMarginMilestoneThree      
Stock Options [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares authorized       8,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
1,400,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Restricted Stock Units (RSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares authorized       8,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
 
Unrecognized compensation cost, recognition period 2 years 1 year      
Shares available for future grant 9,323,516us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
6,929,661us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember