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STOCK PLANS (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Share-Based Compensation |  |  |  |
Stock-based compensation expense | $ 7,047 | $ 7,345 | $ 15,432 | $ 14,744
Compensation expense from stock options, employees | 4,827 | 5,741 | 11,182 | 11,658
Compensation expense from stock options, non-employee awards | 202 | 29 | 241 | 83
Restricted Stock or Unit Expense | 1,819 | 1,389 | 3,609 | 2,611
Compensation expense from employee stock purchase plan | 199 | 186 | 400 | 392
Stock-based compensation | 7,047 | 7,345 | $ 15,432 | 14,744
Purchase price of common stock, ESPP (as a percent) |  |  | 85.00% |
Shares issued under employee stock purchase plan (shares) |  |  | 34,985 |
Cost of goods sold |  |  |  |
Share-Based Compensation |  |  |  |
Stock-based compensation expense | 1,046 | 1,395 | $ 2,252 | 2,770
Research and development |  |  |  |
Share-Based Compensation |  |  |  |
Stock-based compensation expense | 951 | 647 | 1,648 | 1,304
Selling, general and administrative |  |  |  |
Share-Based Compensation |  |  |  |
Stock-based compensation expense | $ 5,050 | $ 5,303 | $ 11,532 | $ 10,670

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