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Net Loss Per Share (Tables)
 6 Months Ended
Jun. 30, 2020
Earnings Per Share [Abstract]  
Computation of Basic and Diluted Net Loss Per Share The following table sets forth the computation of basic and diluted net loss per share (in thousands, except share and per‑share data):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2020
 
2019
 
2020
 
2019
Numerator:
 
 
 
 
 
 
 
Net loss attributable to common stockholders
$
(24,081
)
 
$
(16,394
)
 
$
(43,701
)
 
$
(28,468
)
Denominator:
 
 
 
 
 
 
 
Weighted‑average common shares and pre-funded warrants outstanding—basic and diluted
96,785,915

 
44,855,083

 
95,754,714

 
41,668,902

Net loss per share attributable to common stockholders —basic and diluted
$
(0.25
)
 
$
(0.37
)
 
$
(0.46
)
 
$
(0.68
)
Schedule of Potential Common Shares Issuable Upon Conversion of Warrants Potential dilutive common share equivalents consist of the following:
 
June 30,
 
2020
 
2019
Stock options to purchase common stock
7,473,613

 
4,637,463

Unvested restricted stock units
159,375

 
275,000

Stock warrants to purchase common stock
14,841,100

 
95,619

Total
22,474,088

 
5,008,082