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Stock Incentive Plans - Additional Information (Detail) (USD $)
12 Months Ended 1 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Aug. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Aggregate pre-tax intrinsic value $ 350,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue $ 75,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue    
Weighted average fair value of options granted $ 3.23us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue $ 2.77us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue    
Stock-based compensation expense 33,000us-gaap_AllocatedShareBasedCompensationExpense 24,000us-gaap_AllocatedShareBasedCompensationExpense 16,000us-gaap_AllocatedShareBasedCompensationExpense  
Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unvested restricted shares outstanding 268,985us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
318,660us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
312,501us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Number of restricted shares vested 103,503us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
105,504us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
   
Intrinsic value of restricted shares vested $ 384,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
     
Common stock cancelled in payment of payroll taxes due on vesting of restricted shares under employee stock incentive plans (in shares) 34,793crv_CommonStockCanceledForPaymentOfPayrollTaxesOnVestingOfShareBasedCompensationShares
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
     
Tax withholding obligations 129,000us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
     
Restricted Stock | Service Contingent        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense 233,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ crv_StockOptionPlanTypeAxis
= crv_ServiceBasedOptionsMember
278,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ crv_StockOptionPlanTypeAxis
= crv_ServiceBasedOptionsMember
440,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ crv_StockOptionPlanTypeAxis
= crv_ServiceBasedOptionsMember
 
Unrecognized compensation cost 52,439us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ crv_StockOptionPlanTypeAxis
= crv_ServiceBasedOptionsMember
     
Unvested restricted shares outstanding 103,494us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ crv_StockOptionPlanTypeAxis
= crv_ServiceBasedOptionsMember
     
Unrecognized compensation costs are expected to be recognized over a weighted average periods (years) 1 year      
Aggregate intrinsic value 335,321us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ crv_StockOptionPlanTypeAxis
= crv_ServiceBasedOptionsMember
     
Restricted Stock | Service Contingent | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 3 years      
Restricted Stock | Service Contingent | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 4 years      
Restricted Stock | Performance Contingent        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense 0us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ crv_StockOptionPlanTypeAxis
= us-gaap_PerformanceSharesMember
0us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ crv_StockOptionPlanTypeAxis
= us-gaap_PerformanceSharesMember
0us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ crv_StockOptionPlanTypeAxis
= us-gaap_PerformanceSharesMember
 
Unrecognized compensation cost 567,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ crv_StockOptionPlanTypeAxis
= us-gaap_PerformanceSharesMember
     
Unvested restricted shares outstanding 165,491us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ crv_StockOptionPlanTypeAxis
= us-gaap_PerformanceSharesMember
     
Unrecognized compensation costs are expected to be recognized over a weighted average periods (years) 9 months 18 days      
Aggregate intrinsic value 536,200us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ crv_StockOptionPlanTypeAxis
= us-gaap_PerformanceSharesMember
     
Unvested Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost $ 0us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= crv_UnvestedStockOptionsMember
     
2012 Equity Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares initially authorized for issuance under equity incentive plan       300,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ crv_IncentiveCompensationPlansEmployeesAxis
= crv_EquityIncentivePlanTwentyTwelveMember
Additional shares authorized for issuance under equity incentive plan       17,666us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized
/ crv_IncentiveCompensationPlansEmployeesAxis
= crv_EquityIncentivePlanTwentyTwelveMember
Shares redistributed and made available for grant 207,333us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ crv_IncentiveCompensationPlansEmployeesAxis
= crv_EquityIncentivePlanTwentyTwelveMember
     
Outstanding shares remained available for future grants 372,332us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ crv_IncentiveCompensationPlansEmployeesAxis
= crv_EquityIncentivePlanTwentyTwelveMember
     
Previously Approved Plans        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares ceased to be issuable       17,666crv_ShareBasedCompensationArrangementByShareBasedPaymentAwardAvailableForGrantCancelledInPeriod
/ crv_IncentiveCompensationPlansEmployeesAxis
= crv_EquityIncentivePlanMember