STOCK-BASED COMPENSATION (Tables)
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6 Months Ended |
Jun. 30, 2016 |
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| Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
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| Stock-based Compensation Expense |
The following table summarizes the stock-based compensation expense recognized in accordance with ASC 718-10 for the three and six months ended June 30, 2016, and June 30, 2015: | | | | | | | | | | | | | | | | | | Three Months Ended | | Six Months Ended | | June 30, | | June 30, | (In thousands) | 2016 |
| 2015 | | 2016 | | 2015 | Cost of revenues | $ | 293 |
| | $ | 257 |
| | $ | 383 |
| | $ | 506 |
| Research and development | 1,940 |
| | 1,306 |
| | 3,409 |
| | 2,697 |
| Sales and marketing | 899 |
| | 878 |
| | 1,926 |
| | 1,890 |
| General and administrative | 1,880 |
| | 1,309 |
| | 3,710 |
| | 3,048 |
| Total stock-based compensation expense | $ | 5,012 |
| | $ | 3,750 |
| | $ | 9,428 |
| | $ | 8,141 |
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| Summary of Option Activity Under the Plans |
A summary of stock options outstanding as of June 30, 2016, 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, 2016 | 1,030 |
| | $ | 27.58 |
| | | | | Granted | — |
| | $ | — |
| | | | | Exercised | (44 | ) | | $ | 23.31 |
| | | | | Forfeited or expired | — |
| | $ | — |
| | | | | Outstanding at June 30, 2016 | 986 |
| | $ | 27.77 |
| | 2.76 | | $ | 21,911 |
| Exercisable at June 30, 2016 | 986 |
| | $ | 27.77 |
| | 2.76 | | $ | 21,911 |
| Vested and expected to vest at June 30, 2016 | 986 |
| | $ | 27.77 |
| | 2.76 | | $ | 21,911 |
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| Performance Based Awards (PSUs) |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Schedule of Share-based Compensation, Restricted Stock Units Award Activity |
A summary of PSUs outstanding as of June 30, 2016, 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, 2016 | 11 |
| | $ | 52.35 |
| | | | | Granted | 100 |
| | $ | 46.12 |
| | | | | Vested | (11 | ) | | $ | 52.35 |
| | | | | Forfeited | — |
| | $ | — |
| | | | | Outstanding at June 30, 2016 | 100 |
| | $ | 46.12 |
| | 0.50 | | $ | 4,983 |
| Outstanding and expected to vest at June 30, 2016 | 97 |
| | | | 0.50 | | $ | 4,834 |
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| Long-Term Performance-Based Awards (PRSUs) |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Schedule of Share-based Compensation, Restricted Stock Units Award Activity |
A summary of PRSUs outstanding as of June 30, 2016, 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, 2016 | 129 |
| | $ | 53.75 |
| | | | | Granted | 78 |
| | $ | 43.26 |
| | | | | Vested | — |
| | $ | — |
| | | | | Forfeited | — |
| | $ | — |
| | | | | Outstanding at June 30, 2016 | 207 |
| | $ | 49.78 |
| | 1.60 | | $ | 10,351 |
| Outstanding and expected to vest at June 30, 2016 | 96 |
| | | | 1.57 | | $ | 4,777 |
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| Restricted Stock Units (RSUs) |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Schedule of Share-based Compensation, Restricted Stock Units Award Activity |
A summary of RSUs outstanding as of June 30, 2016, 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, 2016 | 681 |
| | $ | 46.98 |
| | | | | Granted | 297 |
| | $ | 45.82 |
| | | | | Vested | (251 | ) | | $ | 45.14 |
| | | | | Forfeited | (11 | ) | | $ | 46.75 |
| | | | | Outstanding at June 30, 2016 | 716 |
| | $ | 47.15 |
| | 1.70 | | $ | 35,789 |
| Outstanding and expected to vest at June 30, 2016 | 657 |
| | | | 1.65 | | $ | 32,829 |
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