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Consolidated Statements of Comprehensive Income (Loss) (Parentheticals) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Income tax benefit (expense) included in unrealized gain on short-term investments | $ 0 | $ 396

X
- Definition Income tax included in unrealized gain on short-term investments + References No definition available. + Details
Name: | actg_IncomeTaxIncludedInUnrealizedGainOnShortTermInvestments
Namespace Prefix: | actg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration