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STOCK-BASED COMPENSATION (Tables) | 3 Months Ended
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Mar. 31, 2017
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, 2017, and March 31, 2016:
| Three Months Ended
| March 31,
(In thousands) | 2017 |  | 2016
Cost of revenues | $ | 143 |  |  | $ | 90 |
Research and development | 1,634 |  |  | 1,469 |
Sales and marketing | 1,097 |  |  | 1,027 |
General and administrative | 2,095 |  |  | 1,830 |
Total stock-based compensation expense | $ | 4,969 |  |  | $ | 4,416 |
Summary of Option Activity Under the Plans | A summary of stock options outstanding as of March 31, 2017, 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, 2017 | 697 |  |  | $ | 28.62 |  |  |  |  |
Granted | — |  |  | — |  |  |  |  |
Exercised | (51 | ) |  | $ | 34.13 |  |  |  |  |
Forfeited or expired | — |  |  | — |  |  |  |  |
Outstanding at March 31, 2017 | 646 |  |  | $ | 28.17 |  |  | 2.51 |  | $ | 24,268 |
Vested and exercisable at March 31, 2017 | 646 |  |  |  |  | 2.51 |  | $ | 24,268 |
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, 2017, 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, 2017 | 99 |  |  | $ | 46.25 |  |  |  |  |
Granted | 55 |  |  | $ | 64.11 |  |  |  |  |
Vested | (99 | ) |  | $ | 46.25 |  |  |  |  |
Forfeited | — |  |  | — |  |  |  |  |
Outstanding at March 31, 2017 | 55 |  |  | $ | 64.11 |  |  | 0.75 |  | $ | 3,616 |
Outstanding and expected to vest at March 31, 2017 | 46 |  |  |  |  | 0.75 |  | $ | 3,020 |
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, 2017, 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, 2017 | 150 |  |  | $ | 47.65 |  |  |  |  |
Granted | 71 |  |  | $ | 63.00 |  |  |  |  |
Vested | — |  |  | — |  |  |  |  |
Forfeited | (7 | ) |  | $ | 47.89 |  |  |  |  |
Outstanding at March 31, 2017 | 214 |  |  | $ | 52.75 |  |  | 1.76 |  | $ | 14,083 |
Outstanding and expected to vest at March 31, 2017 | 183 |  |  |  |  | 1.96 |  | $ | 12,002 |
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, 2017, 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, 2017 | 718 |  |  | $ | 47.54 |  |  |  |  |
Granted | 115 |  |  | $ | 62.72 |  |  |  |  |
Vested | (110 | ) |  | $ | 45.14 |  |  |  |  |
Forfeited | (19 | ) |  | $ | 47.55 |  |  |  |  |
Outstanding at March 31, 2017 | 704 |  |  | $ | 50.40 |  |  | 1.70 |  | $ | 46,235 |
Outstanding and expected to vest at March 31, 2017 | 655 |  |  |  |  | 1.33 |  | $ | 43,092 |

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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&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 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 + Details
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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=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired 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=6415400&loc=d3e5070-113901 + Details
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