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Stock-based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Employee stock-based compensation | The following table shows a summary of the stock-based compensation expense included in the condensed consolidated statements of operations for the three and nine months ended September 30, 2017 and 2016.
| Three Months Ended |  | Nine Months Ended
| September 30, |  | September 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
| (in thousands)
Cost of revenues | $ | 532 |  |  | $ | 516 |  |  | $ | 1,569 |  |  | $ | 1,318 |
Research and development | 1,503 |  |  | 1,585 |  |  | 4,229 |  |  | 4,373 |
Sales and marketing | 1,231 |  |  | 821 |  |  | 3,444 |  |  | 3,459 |
General and administrative | 4,477 |  |  | 2,181 |  |  | 9,280 |  |  | 5,972 |
Total stock-based compensation | $ | 7,743 |  |  | $ | 5,103 |  |  | $ | 18,522 |  |  | $ | 15,122 |
Stock option activity | A summary of the Company’s stock option activity is as follows:
| Outstanding Options |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life (Years) |  | Aggregate Intrinsic Value
|  |  |  |  |  |  | (in thousands)
December 31, 2016 | 7,527,680 |  |  | $ | 19.25 |  |  | 6.0 |  | $ | 101,717 |
Granted | 338,725 |  |  | $ | 38.40 |  |  |  |  |
Exercised | (2,364,523 | ) |  | $ | 10.38 |  |  |  |  |
Canceled | (347,573 | ) |  | $ | 33.72 |  |  |  |  |
September 30, 2017 | 5,154,309 |  |  | $ | 23.60 |  |  | 6.6 |  | $ | 145,402 |
Vested and expected to vest - September 30, 2017 | 4,852,064 |  |  | $ | 23.05 |  |  | 6.5 |  | $ | 139,543 |
Exercisable - September 30, 2017 | 3,458,555 |  |  | $ | 19.94 |  |  | 5.6 |  | $ | 110,203 |
Restricted stock units activity | A summary of the Company’s RSU and RSA activity is as follows:
| Outstanding RSUs and RSAs |  | Weighted Average Grant Date Fair Value Per Share
December 31, 2016 | 587,333 |  |  | $ | 28.85 |
Granted | 934,439 |  |  | $ | 38.53 |
Released | (239,222 | ) |  | $ | 32.15 |
Canceled | (106,522 | ) |  | $ | 31.80 |
September 30, 2017 | 1,176,028 |  |  | $ | 35.60 |
Outstanding and expected to vest - September 30, 2017 | 1,010,848 |  |  | $ | 35.58 |

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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 changes in outstanding nonvested restricted stock units. + 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)(2) -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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