Fair Value Measurements - Summary of Changes in Fair Value of Company's Level 3 Fair Value Measurements (Parenthetical) (Detail) (USD $)	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012
Debt Instrument Fair Value Carrying Value [Abstract]
Unrealized gains or losses	$ 0	$ 0

Fair value measurement with unobservable inputs realized gains or losses.

No definition available.

Name:	cbli_FairValueMeasurementWithUnobservableInputsRealizedGainsOrLosses
Namespace Prefix:	cbli_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration