INCOME TAXES - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Tax Credit Carryforward [Line Items]
Effective tax rate	0.00%	(30.60%)	46.10%
Statutory U.S. federal tax rate	21.00%	21.00%	35.00%
Income tax (benefit) expense	$ (47)	$ 39,654	$ (175,254)
Tax cuts and jobs act, provisional tax benefit			17,600
Increase in valuation allowance	103,500
Operating loss carryforwards, not subject to expiration	127,400
Increase (decrease) in unrecognized tax benefits	2,400	$ 600	$ 2,500
Domestic Tax Authority
Tax Credit Carryforward [Line Items]
Operating loss carryforwards	332,800
Tax credit carryforward, amount	26,100
Domestic Tax Authority | Lumara Health Inc.
Tax Credit Carryforward [Line Items]
Operating loss carryforwards	123,100
Tax credit carryforward, amount	2,300
State and Local Jurisdiction
Tax Credit Carryforward [Line Items]
Operating loss carryforwards	184,600
Tax credit carryforward, amount	2,500
State and Local Jurisdiction | Lumara Health Inc.
Tax Credit Carryforward [Line Items]
Operating loss carryforwards	16,600
Capital Loss Carryforward | Discontinued Operations, Held-for-sale or Disposed of by Sale | CBR business
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	90,400
Interest Expense Carryforward
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	23,600
Perosphere Pharmaceuticals Inc. | Domestic Tax Authority
Tax Credit Carryforward [Line Items]
Operating loss carryforwards	21,400
Tax credit carryforward, amount	2,300
Perosphere Pharmaceuticals Inc. | State and Local Jurisdiction
Tax Credit Carryforward [Line Items]
Operating loss carryforwards	14,600
Tax credit carryforward, amount	$ 1,200