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v3.19.1

Supplemental Cash Flow Information (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Supplemental Cash Flow Information [Abstract] |  |
Cash paid for state income taxes | $ 140,000 | $ 181,000
Foreign withholding taxes | $ 1,093,000 | $ 2,865,000

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