Net Loss Per Share (Tables)
12 Months Ended
Dec. 31, 2020
Net Loss Per Share  
Schedule of calculation of basic and diluted net loss per share attributable to common stockholders

Basic and diluted net loss per share attributable to common stockholders was calculated as follows (in thousands, except share and per share amounts):

Year ended December 31, 

    

2020

    

2019

    

2018

Numerator:

 

  

 

  

 

  

Net loss

$

(167,731)

$

(163,458)

$

(89,195)

 

  

 

  

 

  

Denominator:

 

  

 

  

 

  

Weighted average common shares outstanding, basic and diluted

 

80,624,608

 

78,688,878

 

39,285,468

Net loss per share, basic and diluted

$

(2.08)

$

(2.08)

$

(2.27)

Schedule of dilutive securities excluded from computations of diluted weighted average shares outstanding

Year ended December 31, 

    

2020

    

2019

    

2018

Unvested restricted common stock (1)

 

252,000

 

376,514

 

2,230,235

Stock options to purchase common stock

 

16,318,124

 

15,103,907

 

14,784,770

 

16,570,124

 

15,480,421

 

17,015,005

(1)Includes unvested restricted stock and, in 2018, vested restricted stock issued for promissory notes.