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Commitments and Contingencies - Narrative (Details)
Sep. 30, 2017
USD ($)
Dec. 28, 2015
firm
Other Commitments [Line Items]    
Number of venture firms invested in Lifesize | firm   3
Parent guarantee for purchase obligation of third party contract manufacturer    
Other Commitments [Line Items]    
Maximum amount of the guarantees $ 3,800,000  
Guarantees outstanding 1,400,000  
Indemnification agreement    
Other Commitments [Line Items]    
Amount accrued for indemnification provisions $ 0