Inventories - Losses on Valuation of Inventory (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Inventory Disclosure [Abstract]
Losses incurred on valuation of inventory and write-off of obsolete inventory	$ 0	$ 0	$ 278	$ 0

Loss On Inventory Valuation With Obsolete Inventory Write Off

No definition available.

Name:	clro_LossOnInventoryValuationWithObsoleteInventoryWriteOff
Namespace Prefix:	clro_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration