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Selected Quarterly Financial Data - Summary of Selected Quarterly Financial Data (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
Consolidated Statement of Operations Data:                      
Total revenue $ 10,859 $ 12,475 $ 10,735 $ 6,562 $ 6,648 $ 7,151 $ 7,129 $ 7,216 $ 40,631 $ 28,144 $ 27,306
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
Net loss per common share attributable to CareDx, Inc., basic $ (0.73) $ (0.20) $ (0.77) $ (0.81) $ (0.40) $ (0.29) $ (0.27) $ (0.19) $ (2.39) $ (1.16) $ 0.13
Net loss per common share attributable to CareDx, Inc., diluted $ (0.73) $ (0.26) $ (0.77) $ (0.81) $ (0.40) $ (0.29) $ (0.27) $ (0.19) $ (2.39) $ (1.16) $ 0.10
Shares used in calculation of net loss per share attributable to CareDx, Inc., basic 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
Shares used in calculation of net income loss per share attributable to CareDx, Inc., diluted 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
Consolidated Balance Sheet Data:                      
Total assets $ 76,730 $ 102,092 $ 100,453 $ 48,834 $ 55,638 $ 59,342 $ 61,366 $ 63,277 $ 76,730 $ 55,638  
Long-term debt, net of current portion $ 1,098 $ 8,496 $ 10,072 $ 11,368 $ 12,887 $ 12,125 $ 13,389 $ 14,609 $ 1,098 $ 12,887