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Stock Incentive Plans (Tables) | 9 Months Ended
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Sep. 30, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Summary of Share-based Awards Available for Grant under 2016 Plan | A summary of share-based awards available for grant under the 2016 Plan is as follows:
|  | Options Available for Grant |
Balance at December 31, 2015 |  |  | 331,938 |
Additional options authorized |  |  | 3,865,000 |
Options granted |  |  | (466,914 | )
Options forfeited |  |  | 13,013 |
Balance at December 31, 2016 |  |  | 3,743,037 |
Additional options authorized |  |  | 1,106,966 |
Options granted |  |  | (800,846 | )
Options forfeited |  |  | 15,415 |
Balance at September 30, 2017 |  |  | 4,064,572 |
Summary of Stock Option Activity Under 2006 and 2016 Plans, Including Grants to Non-employees | The following table summarizes stock option activity under the 2006 and 2016 Plans, including grants to non-employees:
|  |  |  |  |  | Options Outstanding |
|  | Options Outstanding |  |  | Weighted- Average Exercise Price Per Share |  |  | Weighted- Average Remaining Contractual Life (years) |  |  | Aggregate Intrinsic Value (in thousands) |
Balances at December 31, 2015 |  |  | 2,685,913 |  |  | $ | 4.81 |  |  |  | 7.63 |  |  | $ | 11,589 |
Options granted |  |  | 361,385 |  |  |  | 15.65 |  |  |  |  |  |  |  |  |
Options exercised |  |  | (57,067 | ) |  |  | 2.33 |  |  |  |  |  |  |  |  |
Options forfeited |  |  | (13,013 | ) |  |  | 6.92 |  |  |  |  |  |  |  |  |
Balances at December 31, 2016 |  |  | 2,977,218 |  |  |  | 6.16 |  |  |  | 6.93 |  |  | $ | 70,979 |
Options granted |  |  | 449,556 |  |  |  | 36.24 |  |  |  |  |  |  |  |  |
Options exercised |  |  | (649,213 | ) |  |  | 3.97 |  |  |  |  |  |  |  |  |
Options forfeited |  |  | (11,659 | ) |  |  | 15.72 |  |  |  |  |  |  |  |  |
Balances at September 30, 2017 |  |  | 2,765,902 |  |  | $ | 11.52 |  |  |  | 7.29 |  |  | $ | 111,634 |
Options exercisable – September 30, 2017 |  |  | 1,656,418 |  |  | $ | 5.43 |  |  |  | 6.36 |  |  | $ | 76,940 |
Options vested and expected to vest – September 30, 2017 |  |  | 2,698,510 |  |  | $ | 11.21 |  |  |  | 7.25 |  |  | $ | 109,750 |

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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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