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Net Loss per Share Attributable to Common Stockholders (Tables)
 9 Months Ended
Sep. 30, 2017
Earnings Per Share [Abstract]  
Schedule of Basic and Diluted Net Loss per Share Attributable to Common Stockholders
The following table sets forth the computation of basic and diluted net loss per share attributable to common stockholders (in thousands, except share and per share data):

 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2017
 
2016
 
2017
 
2016
Numerator:
 
 
 
 
 
 
 
Net loss
$
(4,825
)
 
$
(7,084
)
 
$
(33,905
)
 
$
(25,929
)
Accretion of redeemable convertible preferred stock
—

 
(293
)
 
—

 
(558
)
Net loss attributable to common stockholders
$
(4,825
)
 
$
(7,377
)
 
$
(33,905
)
 
$
(26,487
)
Denominator:
 
 
 
 
 
 
 
Weighted-average shares used to compute net loss per common share, basic and diluted
16,911,575

 
8,483,189

 
16,851,672

 
3,071,456

Net loss per share attributable to common stockholders, basic and diluted
$
(0.29
)
 
$
(0.87
)
 
$
(2.01
)
 
$
(8.62
)
Schedule of Antidilutive Securities Excluded from Computation of Diluted Net Loss Per Share
The following outstanding shares of potentially dilutive securities have been excluded from diluted net loss per share attributable to common stockholders computations for the three and nine months ended September 30, 2017 and 2016 because their inclusion would be anti-dilutive:
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2017
 
2016
 
2017
 
2016
Options to purchase common stock
2,537,744

 
1,496,156

 
2,537,744

 
1,496,156

ESPP shares
26,610

 
—

 
26,610

 
—

Total
2,564,354

 
1,496,156

 
2,564,354

 
1,496,156