COMMERCIAL PARTNERS AND OTHER AGREEMENTS - DepoCyte Product Discontinuance (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
DepoCyte Discontinuation [Line Items]
Discontinued Operation, Tax Effect of Gain (Loss) from Disposal of Discontinued Operation	$ 200		$ 300	$ 5,000
Charges incurred - Lease Costs			216
Charges incurred - Total	(162)	$ (4,495)	(252)	$ (4,495)
Cash Payments made - Lease Costs			(668)
Asset Retirement Obligation, Liabilities Settled			(31)
Cash payments made - Asset Retirement Obligations and Other Discontinuation Costs			36
Cash payments made - total			(699)
Other Adjustments to Income, Discontinued Operations			80
Disposal Group, Including Discontinued Operation, Other Liabilities, Current			16
Disposal of property, plant & equipment and inventory - Total			(96)
Ending Balance - Lease Costs	902		902		$ 1,274
Asset Retirement Obligation, Current	257		257		236
Ending Balance - Total	$ 1,159		1,159		$ 1,510
DepoCyte
DepoCyte Discontinuation [Line Items]
Inventory Write-down		500
Charges incurred - Total		$ (4,500)	$ 252