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Patents Cost and Accumulated Amortization (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Patents [Line Items] |  |  |
Patent cost, disposals | $ 3,000 actg_PatentCostDisposals | $ 3,500 actg_PatentCostDisposals | $ 5,500 actg_PatentCostDisposals
Accumulated amortization, disposals | 298 actg_AccumulatedAmortizationDisposals | 1,753 actg_AccumulatedAmortizationDisposals | 2,466 actg_AccumulatedAmortizationDisposals
Proceeds from Sale of Intangible Assets | $ 3,500 us-gaap_ProceedsFromSaleOfIntangibleAssets | $ 1,000 us-gaap_ProceedsFromSaleOfIntangibleAssets | $ 2,792 us-gaap_ProceedsFromSaleOfIntangibleAssets

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- Definition The cash inflow from disposal of asset without physical form usually arising from contractual or other legal rights, excluding goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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