SUBSEQUENT EVENTS ( Details) (Business combination, USD $) In Billions, except Per Share data	Jun. 30, 2011
Business combination
Subsequent Event
Cash to be received for each share (in dollars per share)	$ 81.50
Total enterprise value	$ 6.8

Name:

ceph_BusinessCombinationTotalEnterpriseValueAsPerMergerAgreement

Namespace Prefix:

ceph

Data Type:

xbrli:monetaryItemType

Balance Type:

debit

Period Type:

instant