INCOME TAXES - Deferred Tax Components (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Assets
Net operating loss carryforwards	$ 79,679	$ 46,888
Tax credit carryforwards	28,641	24,290
Capital loss carryforwards	20,659	20,896
Interest expense carryforwards	5,746	4,318
Equity-based compensation expense	6,106	5,931
Capitalized research & development	2,347	4,635
Intangible assets	67,847	12,565
Reserves	5,721	2,683
Lease liability	5,739
Property, plant and equipment	391	0
Contingent consideration	4	87
Other	9,329	5,389
Valuation allowance	(216,774)	(113,278)
Liabilities
Property, plant and equipment depreciation	0	(614)
Debt instruments	(9,195)	(12,489)
Right of use asset	(5,599)
Other	(11)	(41)
Net deferred tax assets	$ 630	$ 1,260