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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
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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
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

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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=51831255 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(22)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(18)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=51831270 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(20)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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