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Net (Loss) Income Per Share - Computation of Basic and Diluted Net (Loss) Income Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Numerator:                      
Net (loss) income attributable to CareDx, Inc. used to compute basic net loss per share $ (15,483) $ (3,764) $ (10,470) $ (9,752) $ (4,761) $ (3,489) $ (3,185) $ (2,272) $ (39,469) $ (13,707) $ 781
Add: interest expense related to subordinated convertible note                 0 0 364
Less: gain on change in fair value of derivative related to subordinated convertible note                 0 0 (118)
Less: gain on extinguishment of derivative related to subordinated convertible note                 0 0 (120)
Net (loss) income attributable to CareDx, Inc. used to compute diluted net loss per share                 $ (39,469) $ (13,707) $ 907
Denominator:                      
Weighted-average shares used to compute basic net (loss) income per share attributable to CareDx, Inc. 21,270,151 19,098,626 13,568,120 11,969,714 11,902,325 11,890,057 11,835,405 11,814,467 16,496,911 11,860,885 5,815,928
Effect of potentially dilutive securities:                      
Convertible preferred stock                 0 0 2,972,051
Subordinated convertible note                 0 0 134,341
Employee stock options                 0 0 360,681
Weighted-average shares used to compute diluted net (loss) income per share attributable to CareDx, Inc. 21,270,151 19,481,424 13,568,120 11,969,714 11,902,325 11,890,057 11,835,405 11,814,467 16,496,911 11,860,885 9,283,001
Basic $ (0.73) $ (0.20) $ (0.77) $ (0.81) $ (0.40) $ (0.29) $ (0.27) $ (0.19) $ (2.39) $ (1.16) $ 0.13
Diluted $ (0.73) $ (0.26) $ (0.77) $ (0.81) $ (0.40) $ (0.29) $ (0.27) $ (0.19) $ (2.39) $ (1.16) $ 0.10