INCOME TAXES - DEFERRED TAX ASSETS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Deferred tax assets:
Net Operating Losses	$ 6,810	$ 6,414
Tax Credit Carryforwards	1,452	753
In-Process Research & Development	180	253
Intangibles	46,184	34,802
Stock-based compensation	4,992	3,312
Reserves and other accruals not currently deductible	17,294	15,016
Total deferred tax assets	76,912	60,550
Valuation allowance for deferred tax assets	(45,206)	(574)
Deferred tax assets	31,706	59,976
Deferred tax liabilities
Convertible Debt	(31,706)	(36,985)
Net deferred tax asset (liability)		22,991
Increase (decrease) in valuation allowance	44,600	(3,700)	$ 1,600
Federal net operating loss carryforwards related to stock option deductions	11,800
State net operating loss carryforward related to stock option deductions	20,800
Tax effect of the stock option benefit		5,200
Activity related to unrecognized tax benefits
Accrued interest and penalties associated with unrecognized tax benefits	1,000
Unrecognized tax benefits at the beginning of the period	5,686	5,179	3,879
Gross increases - current year tax positions	240	454	27
Gross increases - prior year tax positions	8,761	53	1,273
Unrecognized tax benefits at the end of the period	14,687	5,686	$ 5,179
Unrecognized tax benefit that would affect the effective tax rate	$ 12,200	$ 5,700