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Inventories - Losses on Valuation of Inventory (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011
Inventory Disclosure [Abstract] |  |
Losses incurred on valuation of inventory and write-off of obsolete inventory | $ 1,235 | $ 188

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- Definition Loss On Inventory Valuation With Obsolete Inventory Write Off + References No definition available. + Details
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Namespace Prefix: | clro_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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