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Description of Business	12 Months Ended
Description of Business	Dec. 31, 2017
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Description of Business	Note 1. 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 wireless item connectivity and information delivery. Impinj derives revenue from selling endpoint ICs, readers, gateways, reader ICs 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.