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STOCK-BASED COMPENSATION (Tables) | 3 Months Ended
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Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock-based Compensation Expense | The following table summarizes the stock-based compensation expense recognized in accordance with ASC 718-10 for the three months ended March 31, 2019, and March 31, 2018:
| Three Months Ended
(In thousands) | March 31, 2019 |  | March 31, 2018
Cost of revenues | $ | 271 |  |  | $ | 249 |
Research and development | 1,632 |  |  | 1,839 |
Sales and marketing | 1,061 |  |  | 1,276 |
General and administrative | 1,443 |  |  | 2,261 |
Total stock-based compensation expense | $ | 4,407 |  |  | $ | 5,625 |
Summary of Option Activity Under the Plans | A summary of stock options outstanding as of March 31, 2019, and activity during the three 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 | (85 | ) |  | $ | 20.92 |  |  |  |  |
Forfeited or expired | — |  |  | — |  |  |  |  |
Outstanding at March 31, 2019 | 250 |  |  | $ | 36.33 |  |  | 1.73 |  | $ | 8,404 |
Vested and exercisable at March 31, 2019 | 250 |  |  |  |  | 1.73 |  | $ | 8,404 |
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 March 31, 2019, and activity during the three 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 | 58 |  |  | $ | 69.46 |  |  |  |  |
Vested | (26 | ) |  | $ | 62.87 |  |  |  |  |
Forfeited | — |  |  | — |  |  |  |  |
Outstanding at March 31, 2019 | 58 |  |  | $ | 69.46 |  |  | 0.75 |  | $ | 4,043 |
Outstanding and expected to vest at March 31, 2019 | 38 |  |  |  |  | 0.75 |  | $ | 2,648 |
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 March 31, 2019, and activity during the three 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 March 31, 2019 | 215 |  |  | $ | 63.70 |  |  | 1.75 |  | $ | 15,023 |
Outstanding and expected to vest at March 31, 2019 | 93 |  |  |  |  | 2.41 |  | $ | 6,534 |
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 March 31, 2019, and activity during the three 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 | 119 |  |  | $ | 67.51 |  |  |  |  |
Vested | (112 | ) |  | $ | 54.38 |  |  |  |  |
Forfeited | (4 | ) |  | $ | 56.81 |  |  |  |  |
Outstanding at March 31, 2019 | 898 |  |  | $ | 59.91 |  |  | 2.20 |  | $ | 62,796 |
Outstanding and expected to vest at March 31, 2019 | 827 |  |  |  |  | 1.71 |  | $ | 57,871 |

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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