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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 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Earnings Per Share [Abstract]        
Net loss attributable to Adaptive Biotechnologies Corporation $ (39,788) $ (25,614) $ (59,821) $ (55,466)
Weighted-average shares used in computing net loss per share attributable to Adaptive Biotechnologies Corporation common shareholders, basic 159,855,257 152,082,284 157,700,126 150,646,632
Weighted-average shares used in computing net loss per share attributable to Adaptive Biotechnologies Corporation common shareholders, diluted 159,855,257 152,082,284 157,700,126 150,646,632
Net loss per share attributable to Adaptive Biotechnologies Corporation common shareholders, basic $ (0.25) $ (0.17) $ (0.38) $ (0.37)
Net loss per share attributable to Adaptive Biotechnologies Corporation common shareholders, diluted $ (0.25) $ (0.17) $ (0.38) $ (0.37)