Earnings (Loss) per Share (Tables)

12 Months Ended

Dec. 31, 2017

Earnings (Loss) per Share

Schedule of basic and diluted loss per share

	Year ended December 31,
(in thousands, except per share data)	2015			2016			2017
Net loss for the period	$	(46,964	)	$	(54,890	)	$	(74,356	)
Adjustment to redemption value of silent partnerships		(3,875	)		—			—
Net loss attributable to shareholders		(50,839	)		(54,890	)		(74,356	)
Weighted average number of shares outstanding		10,583,950			21,478,320			29,830,669
Excluded treasury shares on December 31		2,819			—			—
Basic and diluted loss per share	$	(4.80	)	$	(2.56	)	$	(2.49	)

Schedule of common stock equivalents excluded from the calculations of diluted loss per share

	Year ended December 31,
	2015		2016		2017
Stock options		1,327,060		1,904,320		3,338,999