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Net loss per share (Tables)
 12 Months Ended
Dec. 31, 2019
Earnings Per Share [Abstract]  
Schedule of Net Income per Share, Basic and Diluted
The following table presents the calculations of basic and diluted net loss per share:
 
Year ended December 31,
(in thousands, except per share data)
2019
 
2018
 
2017
Numerator:
 
 
 
 
 
Net loss
$
(14,642
)
 
$
(109,034
)
 
$
(182,873
)
 
 
 
 
 
 
Denominator:
 
 
 
 
 
Weighted-average common shares—basic and diluted for Class A and Class B common stock
144,891

 
139,495

 
138,056

 
 
 
 
 
 
Basic and diluted net loss per share
$
(0.10
)
 
$
(0.78
)
 
$
(1.32
)
Schedule of Antidilutive Securities Excluded from Computation of Net Income per Share
The following potentially dilutive shares were not included in the calculation of diluted shares outstanding as the effect would have been anti-dilutive:
 
Year ended December 31,
(in thousands)
2019
 
2018
 
2017
Anti-dilutive stock-based awards
13,039

 
15,356

 
19,022