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Stockholders' equity (Tables) | 9 Months Ended
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Sep. 30, 2015
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 and related information is as follows:
|  | Options outstanding
(shares in thousands) |  | Shares |  | Weighted- average exercise price |  | Aggregate intrinsic value (in thousands)
Outstanding at December 31, 2014: |  | 25,134 |  |  | $ | 6.62 |  |  | $ | 1,425,339 |
Granted |  | 527 |  |  | 47.37 |  |  |
Exercised |  | (12,027 | ) |  | 1.97 |  |  |
Forfeited/Cancelled |  | (249 | ) |  | 18.65 |  |  |
Outstanding at September 30, 2015: |  | 13,385 |  |  | $ | 12.19 |  |  | $ | 276,067 |
Exercisable at September 30, 2015 |  | 8,258 |  |  | $ | 5.48 |  |  | $ | 214,083 |
Vested and expected to vest at September 30, 2015 |  | 13,127 |  |  | $ | 11.94 |  |  | $ | 273,232 |
Schedule of Share-based Compensation, Restricted Stock Units Award Activity | A summary of the Company’s RSU activity is as follows:
(shares in thousands) | Shares |  | Weighted- average grant date fair value
Non-vested shares at December 31, 2014 | 4,307 |  |  | $ | 21.98 |
Granted | 1,525 |  |  | 52.93 |
Vested | (1,372 | ) |  | 16.53 |
Forfeited | (52 | ) |  | 69.51 |
Non-vested shares at September 30, 2015 | 4,408 |  |  | $ | 33.82 |
Allocation of Stock-based Compensation Expense | Total stock-based compensation expense recognized was as follows:
| Three months ended |  | Nine months ended
(in thousands) | September 30, 2015 |  | September 30, 2014 |  | September 30, 2015 |  | September 30, 2014
Stock-based compensation expense: |  |  |  |  |  |  |
Cost of revenue | $ | 410 |  |  | $ | 233 |  |  | $ | 1,043 |  |  | $ | 555 |
Research and development | 4,872 |  |  | 2,428 |  |  | 12,117 |  |  | 5,486 |
Sales and marketing | 3,516 |  |  | 3,225 |  |  | 9,514 |  |  | 6,293 |
General and administrative | 9,072 |  |  | 8,027 |  |  | 39,886 |  |  | 39,809 |
Total stock-based compensation expense | 17,870 |  |  | 13,913 |  |  | 62,560 |  |  | 52,143 |
Total tax benefit recognized | (7,323 | ) |  | (2,949 | ) |  | (22,867 | ) |  | (14,774 | )
Decrease in net income | $ | 10,547 |  |  | $ | 10,964 |  |  | $ | 39,693 |  |  | $ | 37,369 |

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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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + 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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