10. Earnings (Loss) per Share

Basic and diluted loss per share

For the three and nine months ended September 30, 2018 and 2019, basic and diluted net loss per share was determined by dividing net loss attributable to shareholders by the weighted average number of shares outstanding during the period. Diluted net loss per share is the same as basic net loss per share during the periods presented as the effects of the Company’s potential common stock equivalents are antidilutive since the Company had net losses for each period presented below.


	Three Months Ended				Nine Months Ended
	September 30,				September 30,
(in thousands, except per share data)	2018		2019		2018		2019
Net loss for the period	$	(52,825)	$	(17,795)	$	(83,955)	$	(59,719)
Weighted average number of shares outstanding		58,442,987		75,161,192		45,369,040		72,153,405
Basic and diluted loss per share	$	(0.90)	$	(0.24)	$	(1.85)	$	(0.83)

The following ordinary share equivalents were excluded from the calculations of diluted earnings per share as their effect would be anti-dilutive since the Company had net losses for each period presented below:


	Three Months Ended		Nine Months Ended
	September 30,		September 30,
	2018	2019	2018	2019
Stock option awards	5,936,724	8,340,698	5,936,724	8,340,698
Restricted stock units	508,100	1,289,111	508,100	1,289,111