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Net Loss Per Share Attributable to Guardant Health, Inc. Common Stockholders (Tables)
 9 Months Ended
Sep. 30, 2018
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
The following table sets forth the computation of the basic and diluted net loss per share attributable to Guardant Health, Inc. common stockholders:
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2018
 
2017
 
2018
 
2017
 
 
 
 
 
 
 
 
 
(unaudited)
 
(in thousands, except per share data)
Net loss
$
(23,508
)
 
$
(28,590
)
 
$
(58,991
)
 
$
(68,161
)
Fair value adjustment of redeemable noncontrolling interest
(950
)
 
—

 
(950
)
 
—

Net loss attributable to Guardant Health, Inc.
(24,458
)
 
(28,590
)
 
(59,941
)
 
(68,161
)
Deemed dividend related to repurchase of Series A convertible preferred stock
—

 
(4,716
)
 
—

 
(4,716
)
Deemed dividend related to change in conversion rate of Series D convertible preferred stock
—

 
—

 
—

 
(1,058
)
Net loss attributable to Guardant Health, Inc. common stockholders, basic and diluted
$
(24,458
)
 
$
(33,306
)
 
$
(59,941
)
 
$
(73,935
)
Net loss per share attributable to Guardant Health, Inc. common stockholders, basic and diluted
$
(1.94
)
 
$
(2.76
)
 
$
(4.87
)
 
$
(5.76
)
Weighted-average shares used in computing net loss per share attributable to Guardant Health, Inc. common stockholders, basic and diluted
12,582

 
12,073

 
12,300

 
12,831
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share
The following weighted-average common stock equivalents were excluded from the calculation of diluted net loss per share attributable to Guardant Health, Inc. common stockholders for the periods presented as they had an anti-dilutive effect:
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2018
 
2017
 
2018
 
2017
 
 
 
 
 
 
 
 
 
(unaudited)
 
(in thousands)
Convertible preferred stock (on an as if converted basis)
58,265

 
54,757

 
58,265

 
40,286

Stock options issued and outstanding
7,675

 
6,489

 
7,460

 
4,540

Preferred stock warrants (on an as if converted basis)
8

 
8

 
8

 
8

Common stock warrants
203

 
399

 
237

 
402

Common stock subject to repurchase
54

 
26

 
43

 
32

Total
66,205

 
61,679

 
66,013

 
45,268