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STOCK-BASED COMPENSATION (Tables) | 9 Months Ended
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Sep. 30, 2018
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 and nine months ended September 30, 2018, and September 30, 2017:
| Three Months Ended |  | Nine Months Ended
| September 30, |  | September 30,
(In thousands) | 2018 |  | 2017 |  | 2018 |  | 2017
Cost of revenues | $ | 243 |  |  | $ | 391 |  |  | $ | 784 |  |  | $ | 885 |
Research and development | 1,634 |  |  | 2,173 |  |  | 5,744 |  |  | 6,158 |
Sales and marketing | 1,105 |  |  | 1,441 |  |  | 3,507 |  |  | 3,727 |
General and administrative | 1,416 |  |  | 2,521 |  |  | 6,103 |  |  | 7,052 |
Total stock-based compensation expense | $ | 4,398 |  |  | $ | 6,526 |  |  | $ | 16,138 |  |  | $ | 17,822 |
Summary of Option Activity Under the Plans | A summary of stock options outstanding as of September 30, 2018, 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, 2018 | 511 |  |  | $ | 29.03 |  |  |  |  |
Granted | — |  |  | — |  |  |  |  |
Exercised | (136 | ) |  | $ | 23.31 |  |  |  |  |
Forfeited or expired | — |  |  | — |  |  |  |  |
Outstanding at September 30, 2018 | 375 |  |  | $ | 31.11 |  |  | 1.64 |  | $ | 12,036 |
Vested and exercisable at September 30, 2018 | 375 |  |  |  |  | 1.64 |  | $ | 12,036 |
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, 2018, 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, 2018 | 79 |  |  | $ | 63.99 |  |  |  |  |
Granted | 89 |  |  | $ | 62.87 |  |  |  |  |
Vested | (79 | ) |  | $ | 63.99 |  |  |  |  |
Forfeited | — |  |  | — |  |  |  |  |
Outstanding at September 30, 2018 | 89 |  |  | $ | 62.87 |  |  | 0.25 |  | $ | 5,588 |
Outstanding and expected to vest at September 30, 2018 | 27 |  |  |  |  | 0.25 |  | $ | 1,677 |
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, 2018, 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, 2018 | 184 |  |  | $ | 52.80 |  |  |  |  |
Granted | 72 |  |  | $ | 59.90 |  |  |  |  |
Vested | (38 | ) |  | $ | 52.45 |  |  |  |  |
Forfeited | — |  |  | — |  |  |  |  |
Outstanding at September 30, 2018 | 218 |  |  | $ | 55.20 |  |  | 1.24 |  | $ | 13,752 |
Outstanding and expected to vest at September 30, 2018 | 161 |  |  |  |  | 1.01 |  | $ | 10,144 |
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, 2018, 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, 2018 | 948 |  |  | $ | 55.51 |  |  |  |  |
Granted | 268 |  |  | $ | 62.96 |  |  |  |  |
Vested | (288 | ) |  | $ | 53.77 |  |  |  |  |
Forfeited | (23 | ) |  | $ | 59.39 |  |  |  |  |
Outstanding at September 30, 2018 | 905 |  |  | $ | 58.17 |  |  | 1.98 |  | $ | 57,200 |
Outstanding and expected to vest at September 30, 2018 | 828 |  |  |  |  | 1.86 |  | $ | 52,347 |

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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