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Notes Payable (Details 2) (USD $)
Mar. 31, 2015
Sep. 30, 2012
Debt obligations    
Variable rate of interest (as a percent) 9.00%kbio_DebtInstrumentVariableRateOfInterest  
Loan and Security Agreement [Member]    
Debt obligations    
Remainder of 2015 $ 4,418,000us-gaap_ContractualObligationFutureMinimumPaymentsDueRemainderOfFiscalYear
/ us-gaap_LongtermDebtTypeAxis
= kbio_LoanAndSecurityAgreementMember
 
2016 5,910,000us-gaap_ContractualObligationDueInSecondYear
/ us-gaap_LongtermDebtTypeAxis
= kbio_LoanAndSecurityAgreementMember
 
Total minimum payments 10,328,000us-gaap_ContractualObligation
/ us-gaap_LongtermDebtTypeAxis
= kbio_LoanAndSecurityAgreementMember
 
Less amount representing interest (834,000)us-gaap_InterestPayableCurrentAndNoncurrent
/ us-gaap_LongtermDebtTypeAxis
= kbio_LoanAndSecurityAgreementMember
 
Notes payable, gross 9,494,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= kbio_LoanAndSecurityAgreementMember
 
Discount on notes payable (41,000)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 224,000kbio_DebtInstrumentAccretionOfFinalExitFee
/ us-gaap_LongtermDebtTypeAxis
= kbio_LoanAndSecurityAgreementMember
 
Carrying value of notes payable $ 9,677,000us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= kbio_LoanAndSecurityAgreementMember