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Consolidated Statements of Comprehensive Loss (Parenthetical) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Statement of Comprehensive Income [Abstract] |  |
Tax on unrealized loss on foreign currency translation | $ 0 | $ 0

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Namespace Prefix: | ACTG_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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