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Organization and Description of Business	9 Months Ended
Organization and Description of Business	Sep. 30, 2017
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Organization and Description of Business	Note 1. Organization and Description of Business Impinj, Inc., a Delaware corporation, is headquartered in Seattle, Washington. Impinj enables wireless connectivity for everyday items, delivering each item’s unique identity, location and authenticity to business and consumer applications. Impinj’s platform spans endpoints, connectivity and software and provides this wireless item connectivity and information delivery. Impinj derives revenue from selling endpoint integrated circuits, or ICs, reader ICs, readers and gateways, and software as well as from development, service and license agreements. Our integrated platform connects billions of everyday items to applications, delivering real-time information to businesses about items they create, manage, transport and sell.