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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

X

- Definition

Tax on unrealized gain (loss) on foreign currency translation

+ References

No definition available.

+ Details

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

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- References

No definition available.

+ Details

Name:	us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration