DISPOSITION OF THE CORE BUSINESS - Cash Consideration and Fair Value of Assets Disposed (Details) - USD ($) $ in Thousands		3 Months Ended	9 Months Ended	12 Months Ended
	Aug. 30, 2018	Sep. 30, 2018	Sep. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gross consideration from the sale of the Core Business	$ 97,000			$ 0	$ 91,095	$ 0
Closing and transaction costs	5,905
Net proceeds from sale of the Core Business before taxes	91,095
Non-cash commitment to provide inventory	2,305
Core business disposition, current assets
Inventories, net	2,195
Prepaid expenses and other current assets	57
Total current assets	2,252
Property and equipment, net of depreciation	375			149	0
Total non-current assets	1,997
Total assets	4,249
Net gain on sale of the Core Business before taxes	84,541
Income tax expense	16,137
Net gain on sale of the Core Business after income taxes	68,404	$ 69,072	$ 69,072	$ 0	$ 68,404	$ 0
Purchased technology and license rights, net of depreciation
Core business disposition, current assets
Intangible assets	112
Brand name and trademark
Core business disposition, current assets
Intangible assets	$ 1,510