INCOME TAXES - DEFERRED TAX ASSETS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Deferred tax assets:
Net Operating Losses	$ 6,414	$ 5,390
Tax Credit Carryforwards	753	80
In-Process Research & Development	253	330
Intangibles	34,802	3,282
Stock-based compensation	3,312	1,843
Reserves and other accruals not currently deductible	15,016	12,337
Total deferred tax assets	60,550	23,262
Valuation allowance for deferred tax assets	(574)	(4,310)
Deferred tax assets	59,976	18,952
Deferred tax liabilities
Convertible Debt	(36,985)	(41,940)
Deferred tax (liabilities) assets, net	22,991
Deferred tax (liabilities) assets, net		(22,988)
Increase (decrease) in valuation allowance	3,700	1,600	$ (39,800)
Federal net operating loss carryforwards related to stock option deductions	11,000
State net operating loss carryforward related to stock option deductions	19,600
Tax effect of the stock option benefit		5,500
Activity related to unrecognized tax benefits
Accrued interest and penalties associated with unrecognized tax benefits	660
Unrecognized tax benefits at the beginning of the period	5,179	3,879
Gross increases - current year tax positions	454	27
Gross increases - prior year tax positions	53	1,273
Unrecognized tax benefits at the end of the period	$ 5,686	$ 5,179	$ 3,879