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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] |
Summary of Stock Option Activity | A summary of our stock option activity for the nine months ended September 30, 2017, is as follows (number of shares in thousands):
|  | Number of Shares |  | Weighted Average Exercise Price per Share |  | Weighted Average Remaining Contractual Life in Years
Options outstanding as of December 31, 2016 |  | 1,718 |  |  | $ | 8.75 |  |  | 8.2
Options granted |  | 172 |  |  | 24.77 |  |  |
Options exercised |  | (133 | ) |  | 3.83 |  |  |
Options cancelled/forfeited |  | (29 | ) |  | 9.84 |  |  |
Options outstanding as of September 30, 2017 |  | 1,728 |  |  | $ | 10.70 |  |  | 7.9
Schedule of Valuation Assumptions, Stock Options | The following table summarizes information relating to our stock options granted during the three and nine months ended September 30, 2017 and 2016:
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
|  | 2017 |  | 2016 |  | 2017 |  | 2016
Stock options granted (in thousands) |  | — |  |  | — |  |  | 172 |  |  | 750 |
Weighted average exercise price per share |  | $ | — |  |  | $ | — |  |  | $ | 24.77 |  |  | $ | 12.85 |
Weighted average grant-date fair value per share |  | $ | — |  |  | $ | — |  |  | $ | 9.58 |  |  | $ | 4.85 |
Weighted average Black-Scholes model assumptions: |  |  |  |  |  |  |  |
Risk-free interest rate |  | — | % |  | — | % |  | 2.02 | % |  | 1.45 | %
Expected term (in years) |  | — |  |  | — |  |  | 6.4 |  |  | 5.9 |
Expected volatility |  | — | % |  | — | % |  | 35 | % |  | 37 | %
Expected dividend yield |  | — |  |  | — |  |  | — |  |  | — |
Schedule of Restricted Stock Units Activity | A summary of activity in connection with our RSUs for the nine months ended September 30, 2017, is as follows (number of shares in thousands):
|  | Number of Shares |  | Weighted- Average Grant Date Fair Value per Share
Unvested as of December 31, 2016 |  | 496 |  |  | $ | 13.34 |
Granted |  | 307 |  |  | 25.64 |
Vested |  | (139 | ) |  | 12.81 |
Forfeited |  | (46 | ) |  | 16.17 |
Unvested as of September 30, 2017 |  | 618 |  |  | $ | 19.36 |
Schedule of Restricted Stock Awards Activity | A summary of activity in connection with our restricted stock awards for the nine months ended September 30, 2017, follows (number of shares in thousands):
|  | Number of Shares |  | Weighted-Average Grant Date Fair Value per Share
Unvested as of December 31, 2016 |  | 46 |  |  | $ | 8.55 |
Granted |  | 9 |  |  | 33.30 |
Vested |  | (38 | ) |  | 9.33 |
Forfeited |  | — |  |  | — |
Unvested as of September 30, 2017 |  | 17 |  |  | $ | 19.79 |

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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock shares. + 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) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + 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=96867065&loc=d3e5070-113901 + Details
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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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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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