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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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