v2.4.1.9

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Summary Of Accounting Policies [Line Items] |  |  |
Fair value change in trading securities |  |  | $ 2 us-gaap_TradingSecuritiesUnrealizedHoldingGainLoss
Impairment charge | 0 us-gaap_AssetImpairmentCharges | 0 us-gaap_AssetImpairmentCharges | 0 us-gaap_AssetImpairmentCharges
Impairment recognized in respect of other investments |  | 681 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet | 2,543 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet
Land expense | 36 acts_LandUseRightExpense | 36 acts_LandUseRightExpense | 36 acts_LandUseRightExpense
Utilization of subsidy from local authorities of Zhuhai, the People's Republic of China (the "PRC") |  | 1,068 us-gaap_OtherNoncashIncome | 674 us-gaap_OtherNoncashIncome
Number of shares repurchased | 70,774,015 us-gaap_StockRepurchasedDuringPeriodShares | 11,772,294 us-gaap_StockRepurchasedDuringPeriodShares | 14,812,056 us-gaap_StockRepurchasedDuringPeriodShares
Allowance for doubtful accounts receivable | 558 us-gaap_ProvisionForDoubtfulAccounts |  |
Allowances for doubtful accounts receivable written down | 558 us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs |  | (621)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs
Advertising expenses | 604 us-gaap_AdvertisingExpense | 666 us-gaap_AdvertisingExpense | 106 us-gaap_AdvertisingExpense
Share-based compensation | 45 us-gaap_ShareBasedCompensation | 492 us-gaap_ShareBasedCompensation | 1,465 us-gaap_ShareBasedCompensation
Cost of revenue [Member] |  |  |
Summary Of Accounting Policies [Line Items] |  |  |
Share-based compensation | 28 us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | 49 us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | 10 us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember
Research and development expenses [Member] |  |  |
Summary Of Accounting Policies [Line Items] |  |  |
Share-based compensation | 10 us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_ResearchAndDevelopmentExpenseMember | 347 us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_ResearchAndDevelopmentExpenseMember | 1,091 us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_ResearchAndDevelopmentExpenseMember
General and administrative expenses [Member] |  |  |
Summary Of Accounting Policies [Line Items] |  |  |
Share-based compensation | 5 us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember | 79 us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember | 312 us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember
Selling and marketing expenses [Member] |  |  |
Summary Of Accounting Policies [Line Items] |  |  |
Share-based compensation | $ 2 us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingAndMarketingExpenseMember | $ 17 us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingAndMarketingExpenseMember | $ 52 us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingAndMarketingExpenseMember
Dutch auction tender offer [Member] |  |  |
Summary Of Accounting Policies [Line Items] |  |  |
Number of shares repurchased | 60,001,062 us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_ShareRepurchaseProgramAxis = acts_DutchAuctionTenderOfferMember |  |
Minimum [Member] |  |  |
Summary Of Accounting Policies [Line Items] |  |  |
Useful economic lives of purchased software and technology licenses | 1 year |  |
Maximum [Member] |  |  |
Summary Of Accounting Policies [Line Items] |  |  |
Useful economic lives of purchased software and technology licenses | 9 years |  |

X
- Definition Prepaid leasehold land is expensed on a straight-line basis over the respective term of the right to use the land. + References No definition available. + Details
Name: | acts_LandUseRightExpense
Namespace Prefix: | acts_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
Name: | us-gaap_AdvertisingExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of direct write-downs of accounts receivable charged against the allowance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5074-111524 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 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 310 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35755819&loc=SL9156395-115594 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2420-110228 + Details
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Balance Type: | debit
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Other income or gains included in net income that result in no cash inflows or outflows in the period and are not separately disclosed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
Name: | us-gaap_OtherNoncashIncome
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The amount of other than temporary impairment (OTTI) losses on equity securities, OTTI related to credit losses on debt securities, and OTTI losses on debt securities when the entity intends to sell the securities or it is more likely than not that the entity will be required to sell the securities before recovery of its amortized cost basis. Additionally, this item includes OTTI losses recognized during the period on investments accounted for under the cost method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 8B -URI http://asc.fasb.org/extlink&oid=27724398&loc=SL6284393-111563 + Details
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Balance Type: | debit
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- Definition Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.5) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 5 -Article 5 + Details
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Balance Type: | debit
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of unrealized holding gain (loss) recognized in the income statement for investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(c)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e24584-111560 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | credit
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_GeneralAndAdministrativeExpenseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_ResearchAndDevelopmentExpenseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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