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SUPPLEMENTARY BALANCE SHEET INFORMATION (Details 1) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Balance at beginning of year | $ 0 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent | [1] | $ 327 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent |  | $ 308 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Increase (decrease) during the year |  |  | 0 us-gaap_AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease |  | 66 us-gaap_AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease
Bad debt written off | 0 us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs |  | (327)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs |  | (47)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs
Balance at end of year | $ 0 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent | [1] | $ 0 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent | [1] | $ 327 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
[1] | The changes in allowance for doubtful accounts are composed as follows:

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

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- Definition A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of increase (decrease) in the allowance for doubtful accounts. + References No definition available. + Details
Name: | us-gaap_AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
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
Name: | us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration