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Fair Value Measurements and Auction Rate Securities (Details) (USD $) | Dec. 31, 2011
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Fair Value Measurements and Auction Rate Securities [Abstract] |
Auction Rate Securities Par Value | $ 2,425,000

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- Definition Auction Rate Securities Par Value + References No definition available. + Details
Name: | actg_AuctionRateSecuritiesParValue
Namespace Prefix: | actg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | actg_FairValueMeasurementsAndAuctionRateSecuritiesAbstract
Namespace Prefix: | actg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration