2.4.0.8126 - Disclosure - Summary of Stock Options Outstanding (Detail)truefalseIn Thousands, except Per Share data, unless otherwise specifiedfalse1false USDfalsefalseP01_01_2013To06_30_2013http://www.sec.gov/CIK0000934473duration2013-01-01T00:00:002013-06-30T00:00:00sharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0USD_per_ShareDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0$1true 3us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]2false 4gnvc_ShareBasedCompensationArrangementShareBasedPaymentAwardOptionsNumberOfShareOutstandinggnvc_falsenainstantfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse18140001814falsefalsefalsexbrli:sharesItemTypesharesShare based compensation arrangement share based payment award options number of share outstandingNo definition available.false1Outstanding Number of shares3false 4us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2us-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse007 years 5 months 19 daysfalsefalsefalsexbrli:durationItemTypenaWeighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 false0Outstanding Weighted average remaining contractual life (in years)4false 4gnvc_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionOutstandingWeightedAverageExercisePricesgnvc_falsenainstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse5.655.65USD$falsetruefalsenum:perShareItemTypedecimalShare based compensation arrangement by share based payment award option outstanding weighted average exercise prices.No definition available.false3Outstanding Weighted average exercise price5false 4us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumberus-gaap_truenainstantfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse874000874falsefalsefalsexbrli:sharesItemTypesharesThe number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 false1Exercisable Number of shares6false 4us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePriceus-gaap_truenainstantfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse9.289.28USD$falsetruefalsenum:perShareItemTypedecimalThe weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 false3Exercisable Weighted average exercise price7false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2false USDtruefalse$P01_01_2013To06_30_2013_RangeOneMemberusgaapShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxishttp://www.sec.gov/CIK0000934473duration2013-01-01T00:00:002013-06-30T00:00:00falsefalseRange 1us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxisxbrldihttp://xbrl.org/2006/xbrldignvc_RangeOneMemberus-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxisexplicitMemberUSD_per_ShareDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0sharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0USDUSD$nanafalse0Range 18true 3us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]9false 4us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimitus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse0.000.00USD$falsetruefalsenum:perShareItemTypedecimalThe floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 false3Range of exercise prices, minimum10false 4us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimitus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse10.0010.00USD$falsetruefalsenum:perShareItemTypedecimalThe ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 false3Range of exercise prices, maximum11false 4gnvc_ShareBasedCompensationArrangementShareBasedPaymentAwardOptionsNumberOfShareOutstandinggnvc_falsenainstantfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse15020001502falsefalsefalsexbrli:sharesItemTypesharesShare based compensation arrangement share based payment award options number of share outstandingNo definition available.false1Outstanding Number of shares12false 4us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2us-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse008 years 4 months 24 daysfalsefalsefalsexbrli:durationItemTypenaWeighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 false0Outstanding Weighted average remaining contractual life (in years)13false 4gnvc_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionOutstandingWeightedAverageExercisePricesgnvc_falsenainstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse2.552.55USD$falsetruefalsenum:perShareItemTypedecimalShare based compensation arrangement by share based payment award option outstanding weighted average exercise prices.No definition available.false3Outstanding Weighted average exercise price14false 4us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumberus-gaap_truenainstantfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse569000569falsefalsefalsexbrli:sharesItemTypesharesThe number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 false1Exercisable Number of shares15false 4us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePriceus-gaap_truenainstantfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse3.303.30USD$falsetruefalsenum:perShareItemTypedecimalThe weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 false3Exercisable Weighted average exercise price16false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse3false USDtruefalse$P01_01_2013To06_30_2013_RangeTwoMemberusgaapShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxishttp://www.sec.gov/CIK0000934473duration2013-01-01T00:00:002013-06-30T00:00:00falsefalseRange 2us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxisxbrldihttp://xbrl.org/2006/xbrldignvc_RangeTwoMemberus-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxisexplicitMemberUSD_per_ShareDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0sharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0USDUSD$nanafalse0Range 217true 3us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]18false 4us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimitus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse10.0110.01USD$falsetruefalsenum:perShareItemTypedecimalThe floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 false3Range of exercise prices, minimum19false 4us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimitus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse20.0020.00USD$falsetruefalsenum:perShareItemTypedecimalThe ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 false3Range of exercise prices, maximum20false 4gnvc_ShareBasedCompensationArrangementShareBasedPaymentAwardOptionsNumberOfShareOutstandinggnvc_falsenainstantfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse161000161falsefalsefalsexbrli:sharesItemTypesharesShare based compensation arrangement share based payment award options number of share outstandingNo definition available.false1Outstanding Number of shares21false 4us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2us-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse002 years 10 months 13 daysfalsefalsefalsexbrli:durationItemTypenaWeighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 false0Outstanding Weighted average remaining contractual life (in years)22false 4gnvc_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionOutstandingWeightedAverageExercisePricesgnvc_falsenainstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse16.1616.16USD$falsetruefalsenum:perShareItemTypedecimalShare based compensation arrangement by share based payment award option outstanding weighted average exercise prices.No definition available.false3Outstanding Weighted average exercise price23false 4us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumberus-gaap_truenainstantfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse161000161falsefalsefalsexbrli:sharesItemTypesharesThe number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 false1Exercisable Number of shares24false 4us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePriceus-gaap_truenainstantfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse16.1516.15USD$falsetruefalsenum:perShareItemTypedecimalThe weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 false3Exercisable Weighted average exercise price25false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse4false USDtruefalse$P01_01_2013To06_30_2013_RangeThreeMemberusgaapShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxishttp://www.sec.gov/CIK0000934473duration2013-01-01T00:00:002013-06-30T00:00:00falsefalseRange 3us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxisxbrldihttp://xbrl.org/2006/xbrldignvc_RangeThreeMemberus-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxisexplicitMemberUSD_per_ShareDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0sharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0USDUSD$nanafalse0Range 326true 3us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]27false 4us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimitus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse20.0120.01USD$falsetruefalsenum:perShareItemTypedecimalThe floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 false3Range of exercise prices, minimum28false 4us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimitus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse30.0030.00USD$falsetruefalsenum:perShareItemTypedecimalThe ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 false3Range of exercise prices, maximum29false 4gnvc_ShareBasedCompensationArrangementShareBasedPaymentAwardOptionsNumberOfShareOutstandinggnvc_falsenainstantfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse128000128falsefalsefalsexbrli:sharesItemTypesharesShare based compensation arrangement share based payment award options number of share outstandingNo definition available.false1Outstanding Number of shares30false 4us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2us-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse003 years 7 months 10 daysfalsefalsefalsexbrli:durationItemTypenaWeighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 false0Outstanding Weighted average remaining contractual life (in years)31false 4gnvc_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionOutstandingWeightedAverageExercisePricesgnvc_falsenainstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse23.6123.61USD$falsetruefalsenum:perShareItemTypedecimalShare based compensation arrangement by share based payment award option outstanding weighted average exercise prices.No definition available.false3Outstanding Weighted average exercise price32false 4us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumberus-gaap_truenainstantfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse121000121falsefalsefalsexbrli:sharesItemTypesharesThe number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 false1Exercisable Number of shares33false 4us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePriceus-gaap_truenainstantfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse23.7123.71USD$falsetruefalsenum:perShareItemTypedecimalThe weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 false3Exercisable Weighted average exercise price34false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse5false USDtruefalse$P01_01_2013To06_30_2013_RangeFourMemberusgaapShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxishttp://www.sec.gov/CIK0000934473duration2013-01-01T00:00:002013-06-30T00:00:00falsefalseRange 4us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxisxbrldihttp://xbrl.org/2006/xbrldignvc_RangeFourMemberus-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxisexplicitMemberUSD_per_ShareDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0sharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0USDUSD$nanafalse0Range 435true 3us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]36false 4us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimitus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse30.0130.01USD$falsetruefalsenum:perShareItemTypedecimalThe floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 false3Range of exercise prices, minimum37false 4us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimitus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse41.2541.25USD$falsetruefalsenum:perShareItemTypedecimalThe ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 false3Range of exercise prices, maximum38false 4gnvc_ShareBasedCompensationArrangementShareBasedPaymentAwardOptionsNumberOfShareOutstandinggnvc_falsenainstantfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse2300023falsefalsefalsexbrli:sharesItemTypesharesShare based compensation arrangement share based payment award options number of share outstandingNo definition available.false1Outstanding Number of shares39false 4us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2us-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse009 months 25 daysfalsefalsefalsexbrli:durationItemTypenaWeighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 false0Outstanding Weighted average remaining contractual life (in years)40false 4gnvc_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionOutstandingWeightedAverageExercisePricesgnvc_falsenainstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse33.3233.32USD$falsetruefalsenum:perShareItemTypedecimalShare based compensation arrangement by share based payment award option outstanding weighted average exercise prices.No definition available.false3Outstanding Weighted average exercise price41false 4us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumberus-gaap_truenainstantfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse2300023falsefalsefalsexbrli:sharesItemTypesharesThe number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 false1Exercisable Number of shares42false 4us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePriceus-gaap_truenainstantfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse33.3233.32USD$falsetruefalsenum:perShareItemTypedecimalThe weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 false3Exercisable Weighted average exercise pricefalseSummary of Stock Options Outstanding (Detail) (USD $)UnKnownThousandsNoRoundingUnKnowntruefalsefalseSheethttp://www.genvc.com/role/SummaryOfStockOptionsOutstandingDetail142