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Net Loss Per Share - Computation of Basic and Diluted Net Loss Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Numerator:        
Net loss attributable to CareDx, Inc. used to compute basic net loss per share $ (3,764) $ (3,489) $ (23,989) $ (8,945)
Less: Gain on private placement warrants (1,386)      
Net loss attributable to CareDx, Inc. used to compute diluted net loss per share $ (5,150) $ (3,489) $ (23,989) $ (8,945)
Denominator:        
Weighted-average shares used to compute basic net loss per share attributable to CareDx, Inc. 19,098,626 11,890,057 14,894,218 11,846,921
Add: Private placement warrant shares 382,798      
Weighted-average shares used to compute diluted net loss per share attributable to CareDx, Inc. 19,481,424 11,890,057 14,894,218 11,846,921
Net loss per share attributable to CareDx, Inc.:        
Basic $ (0.20) $ (0.29) $ (1.61) $ (0.76)
Diluted $ (0.26) $ (0.29) $ (1.61) $ (0.76)