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Stockholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 2018
Equity [Abstract] |
Summary of Stock Options Activity | The activity for stock options under the Company’s stock plans is as follows:
|  |  |  |  |  |  |  |  |  |  |  |  |  | Remaining |  |  |  |  |
|  |  |  |  |  |  |  |  |  |  |  |  |  | weighted- |  |  |  |  |
|  |  |  |  |  |  |  |  |  | Weighted- |  |  | average |  |  | Per share |
|  |  |  |  |  |  |  |  |  | average |  |  | contractual |  |  | average |
|  |  |  |  |  | Price per |  |  | exercise |  |  | terms |  |  | intrinsic |
|  | Options |  |  | share |  |  | price |  |  | (in years) |  |  | value |
Outstanding as of December 31, 2017 |  |  | 1,836,426 |  |  | $0.60-$83.30 |  |  | $ | 30.77 |  |  |  | 4.58 |  |  | $ | 88.31 |
Granted |  |  | — |  |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Exercised |  |  | (276,016 | ) |  | 0.60-58.95 |  |  |  | 23.61 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (625 | ) |  |  | 24.52 |  |  |  | 24.52 |  |  |  |  |  |  |  |  |
Expired |  |  | — |  |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Outstanding as of June 30, 2018 |  |  | 1,559,785 |  |  | $0.60-$83.30 |  |  | $ | 32.04 |  |  |  | 4.24 |  |  | $ | 154.29 |
Vested and exercisable as of June 30, 2018 |  |  | 1,128,065 |  |  | $0.60-$83.30 |  |  | $ | 27.97 |  |  |  | 4.12 |  |  | $ | 158.36 |
Vested and expected to vest as of June 30, 2018 |  |  | 1,531,385 |  |  | $0.60-$83.30 |  |  | $ | 31.85 |  |  |  | 4.23 |  |  | $ | 154.48 |
Summary of Restricted Stock Activity | Stock Awards activity for the six months ended June 30, 2018, is summarized below:
|  |  |  |  |  |  |  |  |  |  |  |  |  | Weighted- |
|  |  |  |  |  |  |  |  |  |  |  |  |  | average |
|  |  |  |  |  |  |  |  |  |  |  |  |  | grant |
|  |  |  |  |  | Performance |  |  |  |  |  |  | date fair |
|  |  |  |  |  | and |  |  |  |  |  |  | value |
|  | Time-based |  |  | time-based |  |  | Total |  |  | per share |
Unvested restricted stock units outstanding as of December 31, 2017 |  |  | 42,028 |  |  |  | 13,109 |  |  |  | 55,137 |  |  | $ | 90.05 |
Granted |  |  | 28,273 |  |  |  | — |  |  |  | 28,273 |  |  |  | 137.92 |
Vested |  |  | (2,295 | ) |  |  | (4,370 | ) |  |  | (6,665 | ) |  |  | 86.70 |
Forfeited/canceled |  |  | (1,452 | ) |  |  | — |  |  |  | (1,452 | ) |  |  | 104.81 |
Unvested restricted stock units outstanding as of June 30, 2018 (1) |  |  | 66,554 |  |  |  | 8,739 |  |  |  | 75,293 |  |  | $ | 108.04 |
Unvested and expected to vest restricted stock units outstanding as of June 30, 2018 |  |  |  |  |  |  |  |  |  |  | 69,947 |  |  | $ | 108.69 |
Unvested restricted stock awards outstanding as of December 31, 2017 |  |  | 20,789 |  |  |  | 20,785 |  |  |  | 41,574 |  |  | $ | 91.52 |
Granted |  |  | 21,222 |  |  |  | 31,830 |  |  |  | 53,052 |  |  |  | 122.00 |
Vested |  |  | — |  |  |  | (6,928 | ) |  |  | (6,928 | ) |  |  | 91.52 |
Forfeited/canceled |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Unvested restricted stock awards outstanding as of June 30, 2018 (1) |  |  | 42,011 |  |  |  | 45,687 |  |  |  | 87,698 |  |  | $ | 108.30 |
Unvested and expected to vest restricted stock awards outstanding as of June 30, 2018 |  |  |  |  |  |  |  |  |  |  | 69,176 |  |  | $ | 108.43 |
(1) | Outstanding restricted stock units and restricted stock awards are based on the maximum payout of the targeted number of shares.
Summary of Stock-based Compensation Expense | Stock-based compensation Stock-based compensation expense recognized for the three months and six months ended June 30, 2018 and June 30, 2017 was as follows:
|  | Three months ended |  |  | Six months ended |
|  | June 30, |  |  | June 30, |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Stock-based compensation expense by type of award: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock option plan awards |  | $ | 1,548 |  |  | $ | 2,055 |  |  | $ | 3,500 |  |  | $ | 3,799 |
Restricted stock units and restricted stock awards |  |  | 1,416 |  |  |  | 24 |  |  |  | 2,654 |  |  |  | 48 |
Employee stock purchase plan |  |  | 222 |  |  |  | 137 |  |  |  | 413 |  |  |  | 260 |
Total stock-based compensation expense |  | $ | 3,186 |  |  | $ | 2,216 |  |  | $ | 6,567 |  |  | $ | 4,107 |
For the three months and six months ended June 30, 2018 and June 30, 2017, stock-based compensation expense recognized under ASC 718, included in cost of revenue, research and development expense, sales and marketing expense, and general and administrative expense, was as follows:
|  | Three months ended |  |  | Six months ended |
|  | June 30, |  |  | June 30, |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Cost of revenue |  | $ | 259 |  |  | $ | 212 |  |  | $ | 532 |  |  | $ | 403 |
Research and development |  |  | 330 |  |  |  | 250 |  |  |  | 661 |  |  |  | 473 |
Sales and marketing |  |  | 583 |  |  |  | 347 |  |  |  | 1,131 |  |  |  | 662 |
General and administrative |  |  | 2,014 |  |  |  | 1,407 |  |  |  | 4,243 |  |  |  | 2,569 |
Total stock-based compensation expense |  | $ | 3,186 |  |  | $ | 2,216 |  |  | $ | 6,567 |  |  | $ | 4,107 |

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