v2.4.1.9

SHORT-TERM BANK LOANS (Details) (USD $) In Thousands, unless otherwise specified | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Jun. 30, 2014 | Mar. 31, 2014
Loan from bank A in Taiwan [Member] |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |
Amount outstanding | $ 10,000 us-gaap_ShorttermDebtMaximumAmountOutstandingDuringPeriod / us-gaap_DebtInstrumentAxis = acts_DebtInstrumentOneMember | $ 15,000 us-gaap_ShorttermDebtMaximumAmountOutstandingDuringPeriod / us-gaap_DebtInstrumentAxis = acts_DebtInstrumentOneMember |  |  |  |
Interest rate spread over LIBOR |  | 0.80%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = acts_DebtInstrumentOneMember |  |  |  |
Effective interest rate | 1.55%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = acts_DebtInstrumentOneMember |  |  |  |  |
Loan from bank A in Taiwan [Member] | First Tranche [Member] |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |
Amount outstanding | 5,000 us-gaap_ShorttermDebtMaximumAmountOutstandingDuringPeriod / us-gaap_DebtInstrumentAxis = acts_DebtInstrumentOneMember / us-gaap_StatementScenarioAxis = acts_DebtScenarioOneMember | 10,000 us-gaap_ShorttermDebtMaximumAmountOutstandingDuringPeriod / us-gaap_DebtInstrumentAxis = acts_DebtInstrumentOneMember / us-gaap_StatementScenarioAxis = acts_DebtScenarioOneMember |  |  |  |
Interest rate spread over LIBOR | 0.80%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = acts_DebtInstrumentOneMember / us-gaap_StatementScenarioAxis = acts_DebtScenarioOneMember | 0.80%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = acts_DebtInstrumentOneMember / us-gaap_StatementScenarioAxis = acts_DebtScenarioOneMember |  |  |  |
Debt repayment date | Mar. 31, 2015 | Jan. 26, 2015 |  |  |  |
Loan from bank A in Taiwan [Member] | Second Tranche [Member] |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |
Amount outstanding | 5,000 us-gaap_ShorttermDebtMaximumAmountOutstandingDuringPeriod / us-gaap_DebtInstrumentAxis = acts_DebtInstrumentOneMember / us-gaap_StatementScenarioAxis = acts_DebtScenarioTwoMember | 5,000 us-gaap_ShorttermDebtMaximumAmountOutstandingDuringPeriod / us-gaap_DebtInstrumentAxis = acts_DebtInstrumentOneMember / us-gaap_StatementScenarioAxis = acts_DebtScenarioTwoMember |  |  |  |
Interest rate spread over LIBOR | 0.80%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = acts_DebtInstrumentOneMember / us-gaap_StatementScenarioAxis = acts_DebtScenarioTwoMember |  |  |  |  |
Debt repayment date | Mar. 31, 2015 | Jan. 26, 2015 |  |  |  |
Loan from bank B in Hong Kong [Member] |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |
Amount outstanding | $ 11,500 us-gaap_ShorttermDebtMaximumAmountOutstandingDuringPeriod / us-gaap_DebtInstrumentAxis = acts_DebtInstrumentThreeMember |  | $ 8,500 us-gaap_ShorttermDebtMaximumAmountOutstandingDuringPeriod / us-gaap_DebtInstrumentAxis = acts_DebtInstrumentThreeMember | $ 8,500 us-gaap_ShorttermDebtMaximumAmountOutstandingDuringPeriod / us-gaap_DebtInstrumentAxis = acts_DebtInstrumentThreeMember |  |
Effective interest rate |  |  | 1.15%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = acts_DebtInstrumentThreeMember |  |  |
Stated interest rate | 1.36%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = acts_DebtInstrumentThreeMember | 1.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = acts_DebtInstrumentThreeMember |  | 1.84%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = acts_DebtInstrumentThreeMember | 1.28%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = acts_DebtInstrumentThreeMember | 1.24%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = acts_DebtInstrumentThreeMember
Debt repayment date | Jan. 28, 2015 |  | Mar. 31, 2015 | Dec. 31, 2013 |  |

X
- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateEffectivePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentMaturityDate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_ShortTermDebtLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, the maximum amount borrowed at any time during the period. + References No definition available. + Details
Name: | us-gaap_ShorttermDebtMaximumAmountOutstandingDuringPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_DebtInstrumentAxis=acts_DebtInstrumentOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=acts_DebtInstrumentThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |