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Net Loss Per Share Attributable to Adaptive Biotechnologies Corporation Common Shareholders - Computation of the Basic and Diluted Net Loss Per Share Attributable to Common Shareholders (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Earnings Per Share [Abstract]        
Net loss attributable to Adaptive Biotechnologies Corporation $ (55,903) $ (36,719) $ (145,846) $ (101,657)
Weighted-average shares used in computing net loss per share attributable to Adaptive Biotechnologies Corporation common shareholders, basic and diluted 140,833,564 134,372,026 140,060,379 129,289,948
Net loss per share attributable to Adaptive Biotechnologies Corporation common shareholders, basic and diluted $ (0.40) $ (0.27) $ (1.04) $ (0.79)