RESTRUCTURING (Tables)

12 Months Ended

Dec. 31, 2017

Restructuring And Related Activities [Abstract]

Summary of Restructuring Costs by Function

The following table summarizes the restructuring costs by function for the period indicated:

	For the Year Ended December 31
	2017						2016
	(in thousands)
	Cash		Non-cash		Total		Cash		Non-cash		Total
Research and development	$	188	$	—	$	188	$	1,631	$	382	$	2,013
Selling, general and administrative		2,832		—		2,832		2,020		529		2,549
Total restructuring expenses	$	3,020	$	—	$	3,020	$	3,651	$	911	$	4,562

Summary of Restructuring Reserve

The following table summarizes the restructuring reserve for each of the periods indicated:

	For the Year Ended December 31
	2017			2016
	(in thousands)
Restructuring reserve beginning balance	$	1,588		$	—
Restructuring expenses incurred during the period		3,020			3,651
Amounts paid during the period		(1,675	)		(2,063	)
Restructuring reserve ending balance	$	2,933		$	1,588