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Business Description, Basis of Presentation and Significant Accounting Policies - Inventories (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Inventory, Parts and Components, Net of Reserves | $ 47 us-gaap_InventoryPartsAndComponentsNetOfReserves | $ 45 us-gaap_InventoryPartsAndComponentsNetOfReserves
Deferred Revenue Disclosure [Abstract] |  |
Deferred revenue | 5,004 us-gaap_DeferredRevenueCurrent | 4,158 us-gaap_DeferredRevenueCurrent
Deferred Costs, Current | 1,698 us-gaap_DeferredCostsCurrent | 1,520 us-gaap_DeferredCostsCurrent
Deferred gross profit | $ 3,306 clro_DeferredGrossProfit | $ 2,638 clro_DeferredGrossProfit

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- Definition Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date for elements of machinery or equipment held for the purpose of replacing similar parts in the course of repair or maintenance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.BB) -URI http://asc.fasb.org/extlink&oid=27011343&loc=d3e100047-122729 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 6 -Article 5 + Details
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