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Supplemental Cash Flow Information (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Supplemental Cash Flow Information [Abstract] |  |  |
Cash paid for state income taxes | $ 181,000 | $ 223,000 | $ 211,000
Foreign withholding taxes | $ 2,865,000 | $ 14,776,000 | $ 4,421,000

X
- Definition Cash paid for state income taxes during the period. + References No definition available. + Details
Name: | actg_CashPaidForStateIncomeTaxes
Namespace Prefix: | actg_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Definition Foreign withholding taxes + References No definition available. + Details
Name: | actg_ForeignWithholdingTaxes
Namespace Prefix: | actg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_SupplementalCashFlowInformationAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration