Other income (expenses) (Tables)

12 Months Ended

Dec. 31, 2017

Other Income and Expenses [Abstract]

Schedule of Other Income (Expenses)

	YEARS ENDED DECEMBER 31,
(in thousands)	2017			2016			2015
Change in fair value of derivative liability	$	—		$	81		$	(52	)
Foreign exchange losses		(19	)		(13	)		(476	)
Interest income		998			619			108
Miscellaneous expenses		(39	)		(43	)		(100	)
	$	940		$	644		$	(520	)