STOCK PLANS (Details 2) - USD ($) $ in Thousands |
12 Months Ended | ||
---|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|
Share-Based Compensation | |||
Stock-based compensation expense | $ 31,601 | $ 31,248 | $ 33,368 |
Compensation expense from stock options, employees | 24,056 | 24,505 | 27,262 |
Compensation expense from stock options, non-employee awards | 167 | 841 | 2,367 |
Restricted Stock or Unit Expense | 6,698 | 5,117 | 2,887 |
Compensation expense from employee stock purchase plan | 680 | 785 | 852 |
Stock-based compensation | 31,601 | 31,248 | 33,368 |
Cost of revenues | |||
Share-Based Compensation | |||
Stock-based compensation expense | 5,467 | 6,438 | 6,012 |
Research and development | |||
Share-Based Compensation | |||
Stock-based compensation expense | 3,341 | 3,297 | 5,134 |
Selling, general and administrative | |||
Share-Based Compensation | |||
Stock-based compensation expense | $ 22,793 | $ 21,513 | $ 22,222 |