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Warrants to Purchase Common Stock (Details)
Dec. 31, 2014
Jun. 19, 2013
Common stock warrant liabilities    
Issuance of warrant to purchase shares of common stock 38,997us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights  
Exercise price of warrants issued (in dollars per share) 5.13us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights  
Loan and Security Agreement [Member]    
Common stock warrant liabilities    
Exercise price of warrants issued (in dollars per share) 12.11us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights
/ us-gaap_LongtermDebtTypeAxis
= kbio_LoanAndSecurityAgreementMember		 12.11us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights
/ us-gaap_LongtermDebtTypeAxis
= kbio_LoanAndSecurityAgreementMember
Loan and Security Agreement [Member] | Maximum [Member]    
Common stock warrant liabilities    
Issuance of warrant to purchase shares of common stock 49,548us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_LongtermDebtTypeAxis
= kbio_LoanAndSecurityAgreementMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 49,548us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_LongtermDebtTypeAxis
= kbio_LoanAndSecurityAgreementMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember