SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Revenue, Initial Application Period Cumulative Effect Transition (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net revenues	$ 116,306	$ 93,461	$ 98,701	$ 103,319	$ 112,684	$ 104,046	$ 98,615	$ 97,937	$ 411,788	$ 413,282	$ 419,003
Accounts Receivable, after Allowance for Credit Loss, Current	73,773				67,754				73,773	67,754
Inventory, Net	(29,166)				(32,956)				(29,166)	(32,956)
Other Assets, Noncurrent	6,113				9,432				6,113	9,432
Assets	304,293				265,843				304,293	265,843
Accrued Liabilities, Current	36,759				37,547				36,759	37,547
Deferred Revenue, Current	(83,589)				(85,662)				(83,589)	(85,662)
Deferred Revenue, Noncurrent	(14,312)				(13,939)				(14,312)	(13,939)
Liabilities	(459,378)				(432,504)				(459,378)	(432,504)
Retained Earnings (Accumulated Deficit)	(1,179,409)				(1,187,010)				(1,179,409)	(1,187,010)
Stockholders' Equity Attributable to Parent	(155,085)				(166,661)				(155,085)	(166,661)
Cost of Revenue	43,033	35,603	40,253	40,087	44,220	41,485	40,333	40,280	162,713	174,118	176,887
Gross profit	73,273	57,858	56,660	61,282	66,514	60,611	56,332	55,707	249,075	239,164	242,116
Marketing and selling	26,603	22,334	26,129	24,878	23,921	23,461	27,759	26,132	99,944	101,273	106,257
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest									2,525	(9,403)	(13,422)
Net (loss) income	$ 15,370	$ 3,165	$ (10,723)	$ (213)	5,903	$ 878	$ (8,506)	$ (8,949)	$ 7,601	(10,674)	$ (13,555)
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Inventory, Net					$ (5,700)					$ (5,700)