Earnings (Loss) per Share (Tables)

12 Months Ended

Dec. 31, 2019

Earnings (Loss) per Share

Schedule of basic and diluted loss per share

	Year ended December 31,
(in thousands, except per share data)	2017		2018		2019
Net loss for the period	$	(74,356)	$	(114,780)	$	(82,764)
Weighted average number of shares outstanding		29,830,669		50,795,768		74,199,482
Basic and diluted loss per share	$	(2.49)	$	(2.26)	$	(1.12)

Schedule of ordinary share equivalents excluded from the calculations of diluted loss per share

	Year ended December 31
	2017	2018	2019
Stock option awards	3,338,999	6,091,338	8,168,908
Restricted stock units	—	1,372,100	1,051,686