Restructuring (Tables)

12 Months Ended

Dec. 31, 2018

Restructuring [Abstract]

Schedule of changes in the restructuring liability

Restructuring expenses incurred during year ended December 31, 2018 are as follows (in thousands):

				Equity-Based
				Compensation and			Product-Related
	Severance			Professional Fees			and Other			Total
Restructuring expense	$	6,910	(1)	$	7,740	(2)	$	23,293	(3)	$	37,943

(1) As of December 31, 2018, the outstanding liability for accrued but unpaid severance expense was $0.4 million, which is included in the “Accounts payable and accrued liabilities” line item of the consolidated balance sheets.

(2) As of December 31, 2018, there was no outstanding liability for accrued but unpaid equity based compensation and professional fees expense.

(3) Product-related and other expenses primarily relate to impairment write-downs of depreciated property as well as losses incurred on the sale of equipment. As of December 31, 2018, the outstanding liability for accrued but unpaid product related and other expense was $2.3 million, which is included in the “Accounts payable and accrued liabilities” line item of the consolidated balance sheets.