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 |