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Contingencies
 6 Months Ended
Jun. 27, 2020
Commitments and Contingencies Disclosure [Abstract]  
Contingencies
15.
Contingencies
From time to time, Intevac may have certain contingent liabilities that arise in the ordinary course of its business activities. Intevac accounts for contingent liabilities when it is probable that future expenditures will be made and such expenditures can be reasonably estimated.