Earnings (Loss) per Share (Tables)

6 Months Ended

Jun. 30, 2018

Earnings (Loss) per Share

Schedule of basic and diluted loss per share

	Three Months Ended June 30,						Six Months Ended June 30,
(in thousands, except per share data)	2017			2018			2017			2018
Net loss for the period	$	(14,602	)	$	(17,788	)	$	(29,825	)	$	(31,130	)
Weighted average number of shares outstanding	27,186,560			40,515,920			27,197,070			38,723,718
Basic and diluted loss per share	$	(0.54	)	$	(0.44	)	$	(1.10	)	$	(0.80	)

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

	Three Months Ended June 30,		Six Months Ended June 30,
	2017	2018	2017	2018
Stock option awards	2,930,110	4,896,520	2,930,110	4,896,520
Restricted stock units	—	328,300	—	328,300