Sanofi (Details) (Sanofi [Member], USD $) In Millions, unless otherwise specified	6 Months Ended
Jun. 30, 2014	Jul. 31, 2014 Subsequent Event [Member]
Research and Development Collaboration and License Agreements
Initial upfront non-refundable payment	$ 35
Additional non-refundable payment	5
Development, regulatory and commercial contingent payments	250
Maximum days to participate in development and promotion of products	90 days
Maximum amount of royalties to be payable		40
Percentage of sub-license payments to be shared		10.00%
Maximum amount of sub-license payments to be shared		$ 40

Additional upfront non-refundable amount received under agreement.

No definition available.

Name:	kbio_AdditionalUpfrontNonRefundableAmountReceivedUnderAgreement
Namespace Prefix:	kbio_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Development regulatory and commercial contingent receipts.

No definition available.

Name:	kbio_DevelopmentRegulatoryAndCommercialContingentReceipts
Namespace Prefix:	kbio_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Initial upfront non-refundable amount received under agreement.

No definition available.

Name:	kbio_InitialUpfrontNonRefundableAmountReceivedUnderAgreement
Namespace Prefix:	kbio_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Represents the maximum amount of royalties to be payable under agreement.

No definition available.

Name:	kbio_MaximumAmountOfRoyaltiesToBePayableUnderAgreement
Namespace Prefix:	kbio_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Represents the maximum amount of sub-license payments to be shared with Sanofi.

No definition available.

Name:	kbio_MaximumAmountOfSubLicensePaymentsToBeSharedUnderAgreement
Namespace Prefix:	kbio_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Maximum days to participate in development and promotion of products.

No definition available.

Name:	kbio_MaximumDaysToParticipateInDevelopmentAndPromotionOfProducts
Namespace Prefix:	kbio_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Represents the maximum percentage of sub-license payments to be shared with Sanofi.

No definition available.

Name:	kbio_MaximumPercentageOfSubLicensePaymentsToBeSharedUnderAgreement
Namespace Prefix:	kbio_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Name:	us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration