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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
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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 |

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