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STOCK-BASED COMPENSATION (Tables) | 6 Months Ended
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Jun. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock-based Compensation Expense | The following table summarizes the stock-based compensation expense for the three and six months ended June 30, 2017, and June 30, 2016:
| Three Months Ended |  | Six Months Ended
| June 30, |  | June 30,
(In thousands) | 2017 |  | 2016 |  | 2017 |  | 2016
Cost of revenues | $ | 351 |  |  | $ | 293 |  |  | $ | 494 |  |  | $ | 383 |
Research and development | 2,351 |  |  | 1,940 |  |  | 3,985 |  |  | 3,409 |
Sales and marketing | 1,189 |  |  | 899 |  |  | 2,286 |  |  | 1,926 |
General and administrative | 2,436 |  |  | 1,880 |  |  | 4,531 |  |  | 3,710 |
Total stock-based compensation expense | $ | 6,327 |  |  | $ | 5,012 |  |  | $ | 11,296 |  |  | $ | 9,428 |
Summary of Option Activity Under the Plans | A summary of stock options outstanding as of June 30, 2017, and activity during the six 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 | (84 | ) |  | $ | 31.52 |  |  |  |  |
Forfeited or expired | — |  |  | — |  |  |  |  |
Outstanding at June 30, 2017 | 613 |  |  | $ | 28.22 |  |  | 2.34 |  | $ | 27,417 |
Vested and exercisable at June 30, 2017 | 613 |  |  |  |  | 2.34 |  | $ | 27,417 |
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 June 30, 2017, and activity during the six 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 | 88 |  |  | $ | 63.99 |  |  |  |  |
Vested | (99 | ) |  | $ | 46.25 |  |  |  |  |
Forfeited | — |  |  | — |  |  |  |  |
Outstanding at June 30, 2017 | 88 |  |  | $ | 63.99 |  |  | 0.50 |  | $ | 6,382 |
Outstanding and expected to vest at June 30, 2017 | 80 |  |  |  |  | 0.50 |  | $ | 5,807 |
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 June 30, 2017, and activity during the six 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 June 30, 2017 | 214 |  |  | $ | 52.75 |  |  | 1.50 |  | $ | 15,615 |
Outstanding and expected to vest at June 30, 2017 | 186 |  |  |  |  | 1.69 |  | $ | 13,543 |
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 June 30, 2017, and activity during the six 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 | 541 |  |  | $ | 60.46 |  |  |  |  |
Vested | (266 | ) |  | $ | 46.16 |  |  |  |  |
Forfeited | (29 | ) |  | $ | 49.02 |  |  |  |  |
Outstanding at June 30, 2017 | 964 |  |  | $ | 55.12 |  |  | 2.44 |  | $ | 70,284 |
Outstanding and expected to vest at June 30, 2017 | 854 |  |  |  |  | 2.26 |  | $ | 62,277 |

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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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