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Product Warranties - Product Warranty Activity (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Guarantees [Abstract]      
Balance at the beginning of the period $ 283us-gaap_StandardProductWarrantyAccrual $ 364us-gaap_StandardProductWarrantyAccrual $ 572us-gaap_StandardProductWarrantyAccrual
Accruals for warranties for products sold in the period 281us-gaap_StandardProductWarrantyAccrualWarrantiesIssued 327us-gaap_StandardProductWarrantyAccrualWarrantiesIssued 439us-gaap_StandardProductWarrantyAccrualWarrantiesIssued
Fulfillment of warranty obligations (350)us-gaap_StandardProductWarrantyAccrualPayments (297)us-gaap_StandardProductWarrantyAccrualPayments (554)us-gaap_StandardProductWarrantyAccrualPayments
Revisions of estimated obligations (10)vicr_RevisionsOfEstimatedObligations (111)vicr_RevisionsOfEstimatedObligations (93)vicr_RevisionsOfEstimatedObligations
Balance at the end of the period $ 204us-gaap_StandardProductWarrantyAccrual $ 283us-gaap_StandardProductWarrantyAccrual $ 364us-gaap_StandardProductWarrantyAccrual