OTHER INCOME AND LOSS (Tables)

12 Months Ended

Dec. 31, 2017

Other Income And Expenses [Abstract]

Summary of Other Income and Loss

The following table summarizes other income and loss for the periods indicated:

	For the year ended December 31,
	2017			2016			2015
	(in thousand)
Interest expenses	$	(5,781	)	$	(1,892	)	$	(1,365	)
Interest income		1,809			507			890
Other income		1,982			850			629
Gain from sale of Priority Review Voucher		125,000			—			—
Total other income (loss)	$	123,010		$	(535	)	$	154