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Stockholders' Equity and Compensation Arrangements Share - Based Compensation Activity (Tables) | 9 Months Ended
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Sep. 30, 2017
Stockholders' Equity Note [Abstract] |
Schedule of Share-based Compensation, Stock Options, Activity | The table below summarizes the stock option activity for the nine months ended September 30, 2017:
|  | Options |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Term (in years) |  | Aggregate Intrinsic Value (in thousands) (1)
Outstanding and exercisable at December 31, 2016 |  | 991,172 |  |  | $ | 0.77 |  |  | 2.83 |  | $ | 2,527 |
Exercised |  | (84,427 | ) |  | 2.40 |  |  |  |  |
Forfeited |  | (2,789 | ) |  | 1.99 |  |  |  |  |
Outstanding and exercisable at September 30, 2017 |  | 903,956 |  |  | $ | 0.63 |  |  | 2.02 |  | $ | 4,131 |
(1) | The aggregate intrinsic value of options outstanding and exercisable represents the total pretax intrinsic value (the difference between the fair value of the Company's stock on the last day of each period and the exercise price, multiplied by the number of options where the fair value exceeds the exercise price) that would have been received by the option holders had all option holders exercised their options as of September 30, 2017 and December 31, 2016, respectively.
Schedule of Share-based Compensation, Restricted Stock Units Award Activity | The table below summarizes activity regarding unvested restricted stock units granted under the Plans for the nine months ended September 30, 2017:
|  | Restricted Stock Units |  | Weighted- Average Grant Date Fair Value (per share)
Unvested at December 31, 2016 |  | 25,407,846 |  |  | $ | 5.18 |
Granted |  | 19,259,454 |  |  | $ | 3.75 |
Vested |  | (12,790,075 | ) |  | $ | 5.19 |
Forfeited |  | (6,243,880 | ) |  | $ | 4.75 |
Unvested at September 30, 2017 |  | 25,633,345 |  |  | $ | 4.21 |

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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=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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