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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2017
Equity [Abstract] |
Stock Option Transactions | Stock option transactions during the year ended December 31, 2017 are presented below:
|  | Number of Shares |  |  | Weighted- Average Exercise Price |  |  | Weighted- Average Remaining Contractual Term (years) |  |  | Aggregate Intrinsic Value (in thousands) |
Outstanding at December 31, 2016 |  |  | 12,743,877 |  |  | $ | 26.41 |  |  |  |  |  |  |  |  |
Granted |  |  | 7,867,683 |  |  | $ | 34.73 |  |  |  |  |  |  |  |  |
Exercised |  |  | (1,442,411 | ) |  | $ | 18.49 |  |  |  |  |  |  |  |  |
Cancelled/forfeited |  |  | (1,225,713 | ) |  | $ | 30.48 |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2017 |  |  | 17,943,436 |  |  | $ | 30.42 |  |  |  | 8.1 |  |  | $ | 55,794 |
Vested and expected to vest at December 31, 2017 |  |  | 17,943,436 |  |  | $ | 30.42 |  |  |  | 8.1 |  |  | $ | 55,794 |
Exercisable at December 31, 2017 |  |  | 6,464,292 |  |  | $ | 26.07 |  |  |  | 6.6 |  |  | $ | 41,449 |

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (d) -URI http://asc.fasb.org/extlink&oid=96867065&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 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: 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=96867065&loc=d3e5070-113901 + Details
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