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Divestitures - Additional Information (Detail) (USD $)
12 Months Ended 0 Months Ended
Jan. 03, 2015
Mar. 29, 2013
Divestitures [Line Items]    
Earn-out payment received $ 75,000us-gaap_OtherNonoperatingIncome  
DeltaNu    
Divestitures [Line Items]    
Proceeds from sale of assets   500,000us-gaap_ProceedsFromSaleOfOtherProductiveAssets
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= ivac_DeltaNuMember
Percentage of Earn-out receivable   5.00%ivac_PercentageOfEarnOutPaymentsReceivable
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= ivac_DeltaNuMember
Earn-out period   5 years
Maximum earn-out payments during payment period   1,000,000ivac_DispositionOfAssetsMaximumEarnoutPaymentReceivables
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= ivac_DeltaNuMember
DeltaNu | Maximum    
Divestitures [Line Items]    
Maximum consideration receivable from assets sold   1,500,000ivac_ConsiderationReceivableFromSaleOfAssets
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= ivac_DeltaNuMember
DeltaNu | Minimum    
Divestitures [Line Items]    
Annual minimum earn-out payment receivable   $ 100,000ivac_DispositionOfAssetsEarnoutPaymentReceivablesPerYear
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= ivac_DeltaNuMember