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Borrowing Arrangements (Detail) (Warrant [Member])
1 Months Ended
Nov. 01, 2014
Feb. 27, 2015
Share-based Goods and Nonemployee Services Transaction [Line Items]    
Expected volatility 60.00%us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionValuationMethodExpectedVolatilityRate  
Risk free rate 1.62%us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionValuationMethodRiskFreeInterestRate  
Dividend yield 0.00%us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionValuationMethodExpectedDividendRate  
Expected term (in years) 5 years  
Fortress Agreement [Member]
   
Share-based Goods and Nonemployee Services Transaction [Line Items]    
Expected volatility   60.00%us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionValuationMethodExpectedVolatilityRate
/ invt_AgreementAxis
= invt_FortressAgreementMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
Risk free rate   1.70%us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionValuationMethodRiskFreeInterestRate
/ invt_AgreementAxis
= invt_FortressAgreementMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
Dividend yield   0.00%us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionValuationMethodExpectedDividendRate
/ invt_AgreementAxis
= invt_FortressAgreementMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
Expected term (in years)   5 years
National Securities Corporation [Member]
   
Share-based Goods and Nonemployee Services Transaction [Line Items]    
Expected volatility   60.00%us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionValuationMethodExpectedVolatilityRate
/ invt_AgreementAxis
= invt_NationalSecuritiesCorporationMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
Risk free rate   1.50%us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionValuationMethodRiskFreeInterestRate
/ invt_AgreementAxis
= invt_NationalSecuritiesCorporationMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
Dividend yield   0.00%us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionValuationMethodExpectedDividendRate
/ invt_AgreementAxis
= invt_NationalSecuritiesCorporationMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
Expected term (in years)   7 years