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Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended 1 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Fair value of financial assets and liabilities measured at fair value on a recurring basis      
Adjustment made to U.S. Treasury securities $ 0kyth_USTreasurySecuritiesFairValueAdjustment $ 0kyth_USTreasurySecuritiesFairValueAdjustment  
Fair value assets, amount transferred between measurement levels 0kyth_FairValueAssetsAmountTransferredBetweenMeasurementLevels   0kyth_FairValueAssetsAmountTransferredBetweenMeasurementLevels
Fair value liabilities, amount transferred between measurement levels 0kyth_FairValueLiabilitiesAmountTransferredBetweenMeasurementLevels   0kyth_FairValueLiabilitiesAmountTransferredBetweenMeasurementLevels
Assets:      
Marketable securities 45,798us-gaap_AvailableForSaleSecurities 70,435us-gaap_AvailableForSaleSecurities  
Note Payable to Bayer      
Fair value of financial assets and liabilities measured at fair value on a recurring basis      
Interest rate (as a percent)     5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= kyth_UnsecuredPromissoryNoteMember
Discount rate (as a percent)     15.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_LongtermDebtTypeAxis
= kyth_UnsecuredPromissoryNoteMember
Note Payable to Bayer | Bayer      
Fair value of financial assets and liabilities measured at fair value on a recurring basis      
Interest rate (as a percent) 5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_CounterpartyNameAxis
= kyth_BayerMember
/ us-gaap_LongtermDebtTypeAxis
= kyth_UnsecuredPromissoryNoteMember
   
Discount rate (as a percent) 15.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_CounterpartyNameAxis
= kyth_BayerMember
/ us-gaap_LongtermDebtTypeAxis
= kyth_UnsecuredPromissoryNoteMember
   
U.S. government agency securities and Corporate debt securities      
Fair value of financial assets and liabilities measured at fair value on a recurring basis      
Maximum maturity period 2 years    
U.S. government agency securities      
Assets:      
Marketable securities   2,001us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
 
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Assets:      
Cash equivalents 154,959us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
22,691us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
 
Total 154,959us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
22,691us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
 
Recurring basis | Significant Other Observable Inputs (Level 2)      
Assets:      
Total 45,798us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
70,435us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
 
Recurring basis | Significant Other Observable Inputs (Level 2) | U.S. government agency securities      
Assets:      
Marketable securities   2,001us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
 
Recurring basis | Significant Other Observable Inputs (Level 2) | Corporate debt securities:      
Assets:      
Marketable securities 45,798us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
68,434us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
 
Recurring basis | Total      
Assets:      
Cash equivalents 154,959us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
22,691us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
 
Total 200,757us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
93,126us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
 
Recurring basis | Total | U.S. government agency securities      
Assets:      
Marketable securities   2,001us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
 
Recurring basis | Total | Corporate debt securities:      
Assets:      
Marketable securities $ 45,798us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
$ 68,434us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember