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Stock Compensation (Narrative) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Actual percentage of target number of shares of common stock granted as Performance Stock Units 50.00%cry_ActualPercentageOfTargetNumberOfSharesOfCommonStockGrantedAsPerformanceStockUnits 115.00%cry_ActualPercentageOfTargetNumberOfSharesOfCommonStockGrantedAsPerformanceStockUnits 125.00%cry_ActualPercentageOfTargetNumberOfSharesOfCommonStockGrantedAsPerformanceStockUnits
Granted, Shares 562,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross 162,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross 159,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Employees purchased common stock, shares 111,000us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans 97,000us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans 72,000us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
Capitalized stock compensation expense $ 261,000us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount $ 228,000us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount $ 214,000us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount
RSAs To Non-Employee Directors, RSUs To Certain Employees, And RSAs And PSUs To Certain Company Officers [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Authorized from approved stock incentive plans to certain Company officers, non-employee Directors, and certain eligible employees, shares   467,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= cry_RsasToNonEmployeeDirectorsRsusToCertainEmployeesAndRsasAndPsusToCertainCompanyOfficersMember
451,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= cry_RsasToNonEmployeeDirectorsRsusToCertainEmployeesAndRsasAndPsusToCertainCompanyOfficersMember
Aggregate market value of shares granted under approved stock incentive plans   3,100,000cry_ShareBasedCompensationArrangementByShareBasedPaymentAwardOtherThanOptionsMarketValueOfSharesGranted
/ us-gaap_AwardTypeAxis
= cry_RsasToNonEmployeeDirectorsRsusToCertainEmployeesAndRsasAndPsusToCertainCompanyOfficersMember
2,400,000cry_ShareBasedCompensationArrangementByShareBasedPaymentAwardOtherThanOptionsMarketValueOfSharesGranted
/ us-gaap_AwardTypeAxis
= cry_RsasToNonEmployeeDirectorsRsusToCertainEmployeesAndRsasAndPsusToCertainCompanyOfficersMember
RSAs, RSUs, PSUs, And PSAs [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Authorized from approved stock incentive plans to certain Company officers, non-employee Directors, and certain eligible employees, shares 655,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= cry_RestrictedStockAwardsRestrictedStockUnitsPreferredStockUnitsPreferredStockAwardsMember
   
Aggregate market value of shares granted under approved stock incentive plans 6,600,000cry_ShareBasedCompensationArrangementByShareBasedPaymentAwardOtherThanOptionsMarketValueOfSharesGranted
/ us-gaap_AwardTypeAxis
= cry_RestrictedStockAwardsRestrictedStockUnitsPreferredStockUnitsPreferredStockAwardsMember
   
Unrecognized compensation costs 5,300,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
/ us-gaap_AwardTypeAxis
= cry_RestrictedStockAwardsRestrictedStockUnitsPreferredStockUnitsPreferredStockAwardsMember
   
Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted, Shares 562,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
162,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
159,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Unrecognized compensation costs $ 2,100,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
   
Expected weighted-average period for recognizing the unrecognized compensation costs, in years 2 years 2 months 12 days    
Performance Stock Awards (PSAs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Authorized from approved stock incentive plans to certain Company officers, non-employee Directors, and certain eligible employees, shares 250,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= cry_PerformanceStockAwardsMember
   
Expected weighted-average period for recognizing the unrecognized compensation costs, in years 2 years 8 months 12 days    
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Authorized from approved stock incentive plans to certain Company officers, non-employee Directors, and certain eligible employees, shares 5,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
73,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
64,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
Expected weighted-average period for recognizing the unrecognized compensation costs, in years 1 year 7 months 6 days    
Restricted Stock Awards (RSAs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Authorized from approved stock incentive plans to certain Company officers, non-employee Directors, and certain eligible employees, shares 232,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
232,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
229,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Expected weighted-average period for recognizing the unrecognized compensation costs, in years 1 year 1 month 6 days    
Performance Stock Units (PSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Authorized from approved stock incentive plans to certain Company officers, non-employee Directors, and certain eligible employees, shares 185,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
182,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
 
Expected weighted-average period for recognizing the unrecognized compensation costs, in years 8 months 12 days    
Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of target number of shares of common stock granted as Performance Stock Units 50.00%cry_PercentageOfTargetNumberOfSharesOfCommonStockGrantedAsPerformanceStockUnits
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of target number of shares of common stock granted as Performance Stock Units 150.00%cry_PercentageOfTargetNumberOfSharesOfCommonStockGrantedAsPerformanceStockUnits
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
2009 Employee Stock Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Increase in shares authorized under plan 3,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized
/ us-gaap_PlanNameAxis
= cry_TwoThousandNineEmployeeStockIncentivePlanMember