Stock-based Compensation Plans and Awards (Tables)
|
12 Months Ended |
Dec. 31, 2017 |
|---|
| Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
|
| Schedule of shares available for grant and activity |
Shares available for grant as of December 31, 2017 and the activity during the year ended December 31, 2017 are as follows:
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|
Shares Available for Grant |
|
Equity Awards |
|
ESPP |
|
Total |
Balance as of December 31, 2016 |
8,344,668 |
|
|
2,064,427 |
|
|
10,409,095 |
|
Additional shares authorized |
9,406,510 |
|
|
6,000,000 |
|
|
15,406,510 |
|
Restricted stock units granted |
(13,627,053 |
) |
|
— |
|
|
(13,627,053 |
) |
Options granted |
(2,226,443 |
) |
|
— |
|
|
(2,226,443 |
) |
ESPP shares issued |
— |
|
|
(1,287,687 |
) |
|
(1,287,687 |
) |
Options forfeited |
382,769 |
|
|
— |
|
|
382,769 |
|
Options expired |
1,469,714 |
|
|
— |
|
|
1,469,714 |
|
Restricted stock units forfeited |
7,089,976 |
|
|
— |
|
|
7,089,976 |
|
Performance units forfeited* |
883,169 |
|
|
— |
|
|
883,169 |
|
Balance as of December 31, 2017 |
11,723,310 |
|
|
6,776,740 |
|
|
18,500,050 |
|
*Includes shares forfeited for MSUs and PSUs |
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| Schedule of assumptions used for determining the per-share fair value of shares granted under the ESPP |
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Year Ended December 31, |
|
2015 |
|
2016 |
|
2017 |
Expected term (in years) |
0.5 |
|
|
0.5 |
|
|
0.5 |
|
Risk-free interest rate |
0.12 |
% |
|
0.36 |
% |
|
0.78 |
% |
Expected volatility |
52 |
% |
|
44 |
% |
|
45 |
% |
Expected dividend yield |
0 |
% |
|
0 |
% |
|
0 |
% |
|
| Schedule of stock option activity |
Stock option activity during the year ended December 31, 2017 was as follows:
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Options Outstanding |
|
Outstanding
Stock Options |
|
Weighted-Average Exercise Price |
|
Weighted-Average Remaining Contractual Term (in years) |
|
Aggregate Intrinsic Value (1) |
|
(in thousands, except share and per share data) |
Balance as of December 31, 2016 |
9,436,380 |
|
|
$ |
5.74 |
|
|
0.47 |
|
$ |
77,752 |
|
Granted |
2,226,938 |
|
|
9.80 |
|
|
|
|
|
Exercised |
(4,968,577 |
) |
|
1.97 |
|
|
|
|
|
Forfeited |
(903,112 |
) |
|
7.69 |
|
|
|
|
|
Expired |
(1,469,714 |
) |
|
16.15 |
|
|
|
|
|
Balance as of December 31, 2017 |
4,321,915 |
|
|
8.90 |
|
|
5.84 |
|
2,922 |
|
Vested and exercisable as of December 31, 2017 |
2,616,163 |
|
|
8.55 |
|
|
3.43 |
|
2,918 |
|
Expected to vest as of December 31, 2017 |
1,705,752 |
|
|
$ |
9.45 |
|
|
9.53 |
|
$ |
4 |
|
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(1)Amounts represent the difference between the exercise price and the fair value of common stock at each period end for all in the money options outstanding based on the fair value per share of common stock of $13.04 and $4.82 as of December 31, 2016 and 2017. |
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| Schedule of assumptions used for estimating the per-share fair value of stock options |
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Year Ended December 31, |
|
2015 |
|
2016 |
|
2017 |
Expected term (in years) |
6.08 |
|
|
N/A |
|
5.93 - 6.25 |
|
Risk-free interest rate |
1.75% - 1.92% |
|
|
N/A |
|
1.92% - 2.18% |
|
Expected volatility |
49% - 50% |
|
|
N/A |
|
61 |
% |
Expected dividend yield |
0 |
% |
|
N/A |
|
0 |
% |
|
| Schedule of activities for RSUs and MSUs |
The following table summarizes the activities for our MSUs for the year ended December 31, 2017:
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Number of MSUs |
|
Weighted-Average Grant Date Fair Value |
Unvested as of December 31, 2016 |
533,383 |
|
|
$ |
5.49 |
|
Forfeited |
(217,387 |
) |
|
5.64 |
|
Unvested as of December 31, 2017 |
315,996 |
|
|
5.38 |
|
Expected to vest as of December 31, 2017 |
113,672 |
|
|
$ |
5.38 |
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Number of PSUs |
|
Weighted-Average Grant Date Fair Value |
Unvested as of December 31, 2016 |
1,835,250 |
|
|
$ |
5.33 |
|
Forfeited |
(665,782 |
) |
|
5.55 |
|
Unvested as of December 31, 2017 |
1,169,468 |
|
|
5.21 |
|
Expected to vest as of December 31, 2017 |
544,392 |
|
|
$ |
5.09 |
|
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|
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Number of RSUs |
|
Weighted-Average Grant Date Fair Value |
Unvested as of December 31, 2016 |
22,404,417 |
|
|
$ |
13.26 |
|
Granted |
13,627,053 |
|
|
10.13 |
|
Vested |
(9,478,804 |
) |
|
13.80 |
|
Forfeited |
(7,277,071 |
) |
|
12.16 |
|
Unvested as of December 31, 2017 |
19,275,595 |
|
|
11.19 |
|
Expected to vest as of December 31, 2017 |
19,275,595 |
|
|
$ |
11.19 |
|
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| Schedule of stock-based compensation expenses related to all employee and non-employee stock-based awards |
Stock-based compensation expense related to all employee and non-employee stock-based awards was as follows:
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Year ended December 31, |
|
2015 |
|
2016 |
|
2017 |
|
(in thousands) |
Stock-based compensation expense |
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|
|
|
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|
Cost of revenue—Other |
$ |
5,531 |
|
|
$ |
6,108 |
|
|
$ |
3,249 |
|
Cost of revenue—Ticketing service |
40 |
|
|
188 |
|
|
69 |
|
Product development |
23,671 |
|
|
30,975 |
|
|
33,243 |
|
Sales and marketing |
52,747 |
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|
58,118 |
|
|
56,116 |
|
General and administrative |
29,656 |
|
|
43,069 |
|
|
35,754 |
|
Total stock-based compensation expense |
$ |
111,645 |
|
|
$ |
138,458 |
|
|
$ |
128,431 |
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