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Notes Payable (Details 2) (USD $)
Dec. 31, 2014
Sep. 30, 2012
Debt obligations    
Variable rate of interest (as a percent) 9.00%kbio_DebtInstrumentVariableRateOfInterest  
Loan and Security Agreement [Member]    
Debt obligations    
2015 $ 5,947,000us-gaap_ContractualObligationDueInThirdYear
/ us-gaap_LongtermDebtTypeAxis
= kbio_LoanAndSecurityAgreementMember
 
2016 5,909,000us-gaap_ContractualObligationDueInFourthYear
/ us-gaap_LongtermDebtTypeAxis
= kbio_LoanAndSecurityAgreementMember
 
Total minimum payments 11,856,000us-gaap_ContractualObligation
/ us-gaap_LongtermDebtTypeAxis
= kbio_LoanAndSecurityAgreementMember
 
Less amount representing interest (1,067,000)us-gaap_InterestPayableCurrentAndNoncurrent
/ us-gaap_LongtermDebtTypeAxis
= kbio_LoanAndSecurityAgreementMember
 
Notes payable, gross 10,789,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= kbio_LoanAndSecurityAgreementMember
 
Discount on notes payable (53,000)us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_LongtermDebtTypeAxis
= kbio_LoanAndSecurityAgreementMember
(79,000)us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_LongtermDebtTypeAxis
= kbio_LoanAndSecurityAgreementMember
Accretion of the final exit fee payment 192,000kbio_DebtInstrumentAccretionOfFinalExitFee
/ us-gaap_LongtermDebtTypeAxis
= kbio_LoanAndSecurityAgreementMember
 
Carrying value of notes payable $ 10,928,000us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= kbio_LoanAndSecurityAgreementMember