Earnings (Loss) per Share

3 Months Ended

Mar. 31, 2018

8.Earnings (Loss) per Share

Basic and diluted loss per share

For the three months ended March 31, 2017 and 2018, 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 and thus not included in the calculation.

	Three Months Ended March 31,
(in thousands, except per share data)	2017			2018
Net loss for the period	$	(15,223	)	$	(13,342	)
Weighted average number of shares outstanding	27,204,230			36,911,604

Basic and diluted loss per share	$	(0.56	)	$	(0.36	)

The following common stock equivalents were excluded from the calculations of diluted earnings per share as their effect would be anti-dilutive:

	Three Months Ended
	March 31,
(in thousands)	2017	2018
Stock options	278,579	4,853,349
Restricted stock units	—	339,550