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Description of Business (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended 0 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jan. 12, 2012
Description of Business [Line Items]        
Payments to acquire businesses, gross $ 0us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired $ 0us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired $ 150,000us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired  
ADAPTIX, Inc. [Member]        
Description of Business [Line Items]        
Payments to acquire businesses, gross       $ 150,000us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ us-gaap_BusinessAcquisitionAxis
= actg_AdaptixIncMember