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Description of Business	6 Months Ended
Description of Business	Jun. 30, 2018
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Description of Business	Note 1. Description of Business Impinj, Inc. ("we", "us" or "our"), a Delaware corporation, is headquartered in Seattle, Washington. We enables wireless connectivity for everyday items, delivering each item’s unique identity, location and authenticity to business and consumer applications. Our platform spans endpoints, connectivity and software and provides wireless item connectivity and information delivery. We derive revenue from selling endpoint integrated circuits, or ICs, reader ICs and modules, readers, gateways and software. Our integrated platform connects billions of everyday items to applications, delivering real-time information to businesses about items they create, manage, transport and sell.