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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 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Numerator:        
Net loss attributable to CareDx, Inc. used to compute basic and diluted net loss per share $ (7,847) $ (14,062) $ (15,378) $ (23,031)
Denominator:        
Weighted-average shares used to compute basic and diluted net loss per share attributable to CareDx, Inc. 42,132,396 35,549,837 41,873,337 32,599,032
Net loss per share attributable to CareDx, Inc.:        
Basic and diluted $ (0.19) $ (0.40) $ (0.37) $ (0.71)