LONG-TERM DEFERRED REVENUE LIABILITIES AND OTHER LONG-TERM LIABILITIES (Tables)

12 Months Ended

Dec. 31, 2019

Long-term Deferred Revenue Liabilities and Other Long-term Liabilities [Abstract]

Schedule of long-term deferred revenue liabilities and other long-term liabilities

	December 31,
	2019		2018
	(in thousands)
Long-term deferred revenue liabilities	$	36,920	$	52,500
Long-term deferred proceeds, WLR agreement	13,061		—
Long-term deferred proceeds, WLWI agreement	23,768		—
Other	—		13
Total long-term deferred revenue liabilities and other long-term liabilities	$	73,749	$	52,513