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STOCK-BASED COMPENSATION (Tables) | 9 Months Ended
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Sep. 30, 2019
Share-based Payment Arrangement [Abstract] |
Stock-based Compensation Expense | The following table summarizes the stock-based compensation expense recognized in accordance with ASC 718-10 for the three and nine months ended September 30, 2019, and September 30, 2018:
| Three Months Ended |  | Nine Months Ended
(In thousands) | September 30, 2019 |  | September 30, 2018 |  | September 30, 2019 |  | September 30, 2018
Cost of revenues | $ | 280 |  |  | $ | 243 |  |  | $ | 824 |  |  | $ | 784 |
Research and development | 1,893 |  |  | 1,634 |  |  | 5,669 |  |  | 5,744 |
Sales and marketing | 1,211 |  |  | 1,105 |  |  | 3,413 |  |  | 3,507 |
General and administrative | 1,722 |  |  | 1,416 |  |  | 5,103 |  |  | 6,103 |
Total stock-based compensation expense | $ | 5,106 |  |  | $ | 4,398 |  |  | $ | 15,009 |  |  | $ | 16,138 |
Summary of Option Activity Under the Plans | A summary of stock options outstanding as of September 30, 2019, and activity during the nine months then ended, is presented below:
| Shares (In thousands) |  | Weighted- Average Exercise Price |  | Weighted-Average Remaining Contractual Term (In years) |  | Aggregate Intrinsic Value (In thousands)
Outstanding at January 1, 2019 | 335 |  |  | $ | 32.41 |  |  |  |  |
Granted | — |  |  | — |  |  |  |  |
Exercised | (162 | ) |  | $ | 25.51 |  |  |  |  |
Forfeited or expired | — |  |  | — |  |  |  |  |
Outstanding at September 30, 2019 | 173 |  |  | $ | 38.85 |  |  | 1.51 |  | $ | 8,945 |
Vested and exercisable at September 30, 2019 | 173 |  |  |  |  | 1.51 |  | $ | 8,945 |
Performance Based Awards (PSUs) |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Share-based Compensation, Restricted Stock Units Award Activity | A summary of PSUs outstanding as of September 30, 2019, and activity during the nine months then ended, is presented below:
| Shares (In thousands) |  | Weighted- Average Grant Date Fair Value Per Share |  | Weighted-Average Remaining Contractual Term (In years) |  | Aggregate Intrinsic Value (In thousands)
Outstanding at January 1, 2019 | 26 |  |  | $ | 62.87 |  |  |  |  |
Granted | 92 |  |  | $ | 70.08 |  |  |  |  |
Vested | (26 | ) |  | $ | 62.87 |  |  |  |  |
Forfeited | — |  |  | — |  |  |  |  |
Outstanding at September 30, 2019 | 92 |  |  | $ | 70.08 |  |  | 0.25 |  | $ | 8,353 |
Outstanding and expected to vest at September 30, 2019 | 34 |  |  |  |  | 0.25 |  | $ | 3,141 |
Long-Term Performance-Based Awards (PRSUs) |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Share-based Compensation, Restricted Stock Units Award Activity | A summary of PRSUs outstanding as of September 30, 2019, and activity during the nine months then ended, is presented below:
| Shares (In thousands) |  | Weighted- Average Grant Date Fair Value Per Share |  | Weighted-Average Remaining Contractual Term (In years) |  | Aggregate Intrinsic Value (In thousands)
Outstanding at January 1, 2019 | 213 |  |  | $ | 55.48 |  |  |  |  |
Granted | 72 |  |  | $ | 68.17 |  |  |  |  |
Vested | (70 | ) |  | $ | 43.26 |  |  |  |  |
Forfeited | — |  |  | — |  |  |  |  |
Outstanding at September 30, 2019 | 215 |  |  | $ | 63.70 |  |  | 1.25 |  | $ | 19,424 |
Outstanding and expected to vest at September 30, 2019 | 58 |  |  |  |  | 2.25 |  | $ | 5,274 |
Restricted Stock Units (RSUs) |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Share-based Compensation, Restricted Stock Units Award Activity | A summary of RSUs outstanding as of September 30, 2019, and activity during the nine months then ended, is presented below:
| Shares (In thousands) |  | Weighted- Average Grant Date Fair Value Per Share |  | Weighted-Average Remaining Contractual Term (In years) |  | Aggregate Intrinsic Value (In thousands)
Outstanding at January 1, 2019 | 895 |  |  | $ | 58.19 |  |  |  |  |
Granted | 275 |  |  | $ | 68.88 |  |  |  |  |
Vested | (295 | ) |  | $ | 56.15 |  |  |  |  |
Forfeited | (19 | ) |  | $ | 62.32 |  |  |  |  |
Outstanding at September 30, 2019 | 856 |  |  | $ | 62.24 |  |  | 1.81 |  | $ | 77,414 |
Outstanding and expected to vest at September 30, 2019 | 789 |  |  |  |  | 1.72 |  | $ | 71,347 |

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