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Net Loss Per Share Attributable to Guardant Health, Inc. Common Stockholders - Schedule of Net Loss Per Share Attributable to Common Stockholders (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Earnings Per Share [Abstract]      
Net loss $ (246,283) $ (67,851) $ (84,263)
Adjustment of redeemable noncontrolling interest (7,500) (7,800) (800)
Net loss attributable to Guardant Health, Inc. common stockholders, basic and diluted $ (253,783) $ (75,651) $ (85,063)
Net loss per share attributable to common stockholders, basic and diluted (in usd per share) $ (2.60) $ (0.84) $ (2.80)
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted (in shares) 97,504 90,597 30,403