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STOCK PLANS (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Share-Based Compensation
Stock-based compensation expense	$ 7,345	$ 7,665	$ 14,744	$ 16,155
Compensation expense from stock options, employees	5,741	5,789	11,658	12,633
Compensation expense from stock options, non-employee awards	29	437	83	723
Restricted Stock or Unit Expense	1,389	1,140	2,611	2,225
Compensation expense from employee stock purchase plan	186	299	392	574
Stock-based compensation	7,345	7,665	$ 14,744	16,155
Purchase price of common stock, ESPP (as a percent)			85.00%
Shares issued under employee stock purchase plan (shares)			35,745
Cost of goods sold
Share-Based Compensation
Stock-based compensation expense	1,395	1,610	$ 2,770	3,159
Research and development
Share-Based Compensation
Stock-based compensation expense	647	1,015	1,304	1,908
Selling, general and administrative
Share-Based Compensation
Stock-based compensation expense	$ 5,303	$ 5,040	$ 10,670	$ 11,088

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- Definition

Compensation expense from employee stock purchase plan

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Compensation expense from stock options (employee and board of director awards)

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Compensation expense from stock options, non-employee awards

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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The noncash expense that represents the cost of restricted stock or unit distributed to employees as compensation.

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Purchase price of common stock expressed as a percentage of its fair value.

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Number of shares issued during the period as a result of an employee stock purchase plan.

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