Research and Development Collaboration and License Agreements (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2013	Dec. 31, 2012
Contract revenue:
Amortization of upfront fees						$ 5,630kbio_AmortizationOfUpfrontFees
Reimbursement for development-related activities					44us-gaap_ReimbursementRevenue	468us-gaap_ReimbursementRevenue
Contract revenue	$ 4us-gaap_ContractsRevenue	$ 9us-gaap_ContractsRevenue	$ 15us-gaap_ContractsRevenue	$ 16us-gaap_ContractsRevenue	$ 44us-gaap_ContractsRevenue	$ 6,098us-gaap_ContractsRevenue

Repayment received or receivable for expenses incurred on behalf of a client or customer, other than those reimbursements received by landlords from tenants.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 605

-SubTopic 45

-Section 45

-Paragraph 23

-URI http://asc.fasb.org/extlink&oid=21915142&loc=d3e60722-111653

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration