Quarterly report pursuant to Section 13 or 15(d)

Related Party Transactions - Additional Information (Detail)

v2.4.1.9
Related Party Transactions - Additional Information (Detail) (USD $)
0 Months Ended 3 Months Ended 0 Months Ended 1 Months Ended
Sep. 15, 2010
Mar. 31, 2015
Mar. 31, 2014
extension
Jan. 06, 2014
Apr. 01, 2014
Aug. 31, 2010
Dec. 31, 2014
Oct. 31, 2013
Related Party Transaction [Line Items]                
Number of revolving line of credit extensions facility     8cgix_NumberOfExtensionsOfRevolvingCreditFacility          
Warrants exercised (in shares)   0cgix_ClassOfWarrantOrRightExercised            
Convertible shares issued to common stock   9,831,169us-gaap_CommonStockSharesIssued         9,821,169us-gaap_CommonStockSharesIssued 10,000us-gaap_CommonStockSharesIssued
Shares granted   97,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross            
Consulting agreement period 3 years              
Financial Guarantee [Member]                
Related Party Transaction [Line Items]                
Common stock purchased     284,000cgix_WarrantsIssuedToPurchaseCommonStockShares
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_FinancialGuaranteeMember
         
Warrants exercised (in shares)   440,113cgix_ClassOfWarrantOrRightExercised
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_FinancialGuaranteeMember
           
John Pappajohn [Member]                
Related Party Transaction [Line Items]                
Common stock purchased   202,630cgix_WarrantsIssuedToPurchaseCommonStockShares
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cgix_JohnPappajohnMember
           
Warrants adjusted in conjunction with IPO   436,079cgix_WarrantsCommonStockSharesExercisableAdjusted
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cgix_JohnPappajohnMember
           
Warrants outstanding per share   15cgix_ClassOfWarrantOrRightOutstandingPerShare
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cgix_JohnPappajohnMember
           
Additional amount of loan received   6,750,000us-gaap_ProceedsFromRelatedPartyDebt
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cgix_JohnPappajohnMember
           
John Pappajohn [Member] | Financial Guarantee [Member]                
Related Party Transaction [Line Items]                
Common stock purchased     1,051,506cgix_WarrantsIssuedToPurchaseCommonStockShares
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_FinancialGuaranteeMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cgix_JohnPappajohnMember
         
Warrants adjusted in conjunction with IPO   352,312cgix_WarrantsCommonStockSharesExercisableAdjusted
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_FinancialGuaranteeMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cgix_JohnPappajohnMember
           
Warrants outstanding per share   15cgix_ClassOfWarrantOrRightOutstandingPerShare
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_FinancialGuaranteeMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cgix_JohnPappajohnMember
           
John Pappajohn [Member] | IPO [Member]                
Related Party Transaction [Line Items]                
Convertible shares issued to common stock   675,000us-gaap_CommonStockSharesIssued
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cgix_JohnPappajohnMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
           
Conversion price of notes   10us-gaap_DebtInstrumentConvertibleConversionPrice1
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cgix_JohnPappajohnMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
           
Chairman of the Board [Member]                
Related Party Transaction [Line Items]                
Compensation for serving as chairman of the board       100,000cgix_RelatedPartyTransactionCompensationforServingasChairmanoftheBoardAnnualAmount
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_BoardOfDirectorsChairmanMember
       
Chairman of the Board [Member] | 2011 Equity Plan [Member]                
Related Party Transaction [Line Items]                
Shares granted       100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_PlanNameAxis
= cgix_TwoThousandElevenEquityPlanMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_BoardOfDirectorsChairmanMember
       
Equity Dynamics, Inc. [Member]                
Related Party Transaction [Line Items]                
Agreement with related party, fee         10,000cgix_RelatedPartyConsultingFees
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cgix_EquityDynamicsInc.Member
10,000cgix_RelatedPartyConsultingFees
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cgix_EquityDynamicsInc.Member
   
Due to related party   0us-gaap_DueToRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cgix_EquityDynamicsInc.Member
           
Agreement with related party, consulting fee   30,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cgix_EquityDynamicsInc.Member
           
Dr. Chaganti [Member]                
Related Party Transaction [Line Items]                
Consulting and advisory services fee   5,000cgix_RelatedPartyTransactionManagementAdvisoryFee
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cgix_Dr.ChagantiMember
           
Agreement with related party, consulting fee   15,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cgix_Dr.ChagantiMember
15,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cgix_Dr.ChagantiMember
         
Agreement with related party, one-time payment required 50,000cgix_RelatedPartyTransactionOneTimePaymentForRight
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cgix_Dr.ChagantiMember
             
Agreement with related party, percentage of net revenues required to be paid 1.00%cgix_ConsiderationPercentageOfFuturePotentialRevenuesFromRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cgix_Dr.ChagantiMember
             
Patents expense paid   150,000cgix_PatentExpenses
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cgix_Dr.ChagantiMember
           
Number of patents were issued   3cgix_RelatedPartyTransactionNumberOfPatents
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cgix_Dr.ChagantiMember
           
Dr. Chaganti [Member] | 2011 Equity Plan [Member]                
Related Party Transaction [Line Items]                
Shares granted   200,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_PlanNameAxis
= cgix_TwoThousandElevenEquityPlanMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cgix_Dr.ChagantiMember
           
Common stock, shares purchased price per share   15.89us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerShareWeightedAveragePriceOfSharesPurchased
/ us-gaap_PlanNameAxis
= cgix_TwoThousandElevenEquityPlanMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cgix_Dr.ChagantiMember
           
Award vesting period   4 years            
Compensation for Serving as Chairman of Board [Member] | Chairman of the Board [Member]                
Related Party Transaction [Line Items]                
Options granted period       10 years        
Number of installments       2cgix_SharebasedCompensationArrangementbySharebasedPaymentAwardAwardVestingNumberofInstallments
/ us-gaap_RelatedPartyTransactionAxis
= cgix_CompensationforServingasChairmanofBoardMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_BoardOfDirectorsChairmanMember
       
Consulting and Advisory Agreement [Member]                
Related Party Transaction [Line Items]                
Non-cash stock-based compensation expense   62,500us-gaap_StockOptionPlanExpense
/ us-gaap_RelatedPartyTransactionAxis
= cgix_ConsultingandAdvisoryAgreementMember
0us-gaap_StockOptionPlanExpense
/ us-gaap_RelatedPartyTransactionAxis
= cgix_ConsultingandAdvisoryAgreementMember
         
Restricted Stock [Member]                
Related Party Transaction [Line Items]                
Granted   10,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
           
Restricted Stock [Member] | Chairman of the Board [Member]                
Related Party Transaction [Line Items]                
Granted       25,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_BoardOfDirectorsChairmanMember