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Employee benefit plans (Tables) | 9 Months Ended
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Sep. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Share-based Compensation, Stock Options, Activity | A summary of the Company’s stock option activity for the nine months ended September 30, 2016 is as follows:
| Options outstanding
| Shares (in thousands) |  | Weighted- average exercise price |  | Weighted- average remaining contractual term (in years) |  | Aggregate intrinsic value (in thousands)
Outstanding at December 31, 2015: | 13,081 |  |  | $ | 11.82 |  |  | 6.70 |  | $ | 108,846 |
Granted | 2,516 |  |  | 11.33 |  |  |  |  |
Exercised | (1,442 | ) |  | 1.53 |  |  |  |  |
Forfeited/Cancelled | (1,115 | ) |  | 19.61 |  |  |  |  |
Outstanding at September 30, 2016: | 13,040 |  |  | $ | 12.20 |  |  | 6.41 |  | $ | 86,550 |
Vested and expected to vest at September 30, 2016 | 12,803 |  |  | $ | 12.12 |  |  | 6.37 |  | $ | 85,781 |
Exercisable at September 30, 2016 | 8,132 |  |  | $ | 9.28 |  |  | 5.51 |  | $ | 73,387 |
Schedule of Share-based Compensation, Restricted Stock Units Award Activity | A summary of the Company’s RSU activity for the nine months ended September 30, 2016 is as follows:
| Shares (in thousands) |  | Weighted- average grant date fair value
Non-vested shares at December 31, 2015 | 4,638 |  |  | $ | 32.15 |
Granted | 6,912 |  |  | 12.15 |
Vested | (1,229 | ) |  | 26.23 |
Forfeited | (1,031 | ) |  | 26.10 |
Non-vested shares at September 30, 2016 | 9,290 |  |  | $ | 18.73 |
Allocation of Stock-based Compensation Expense | The following table summarizes stock-based compensation included in the condensed consolidated statements of operations:
| Three months ended |  | Nine months ended
(in thousands) | September 30, 2016 |  | September 30, 2015 |  | September 30, 2016 |  | September 30, 2015
Cost of revenue | $ | 426 |  |  | $ | 410 |  |  | $ | 1,195 |  |  | $ | 1,043 |
Research and development | 8,039 |  |  | 4,872 |  |  | 21,135 |  |  | 12,117 |
Sales and marketing | 3,816 |  |  | 3,516 |  |  | 10,699 |  |  | 9,514 |
General and administrative | 6,185 |  |  | 9,072 |  |  | 18,572 |  |  | 39,886 |
Total stock-based compensation expense, before income taxes | 18,466 |  |  | 17,870 |  |  | 51,601 |  |  | 62,560 |
Total tax benefit recognized | (5,573 | ) |  | (7,323 | ) |  | (15,723 | ) |  | (22,867 | )
Total stock-based compensation expense, net of income taxes | $ | 12,893 |  |  | $ | 10,547 |  |  | $ | 35,878 |  |  | $ | 39,693 |

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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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