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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2017
Equity [Abstract] |
Schedule of Common Stock Reserved for Future Issuance | As of December 31, 2017, shares of common stock reserved for future issuance related to outstanding equity awards, warrants, and employee equity incentive plans were as follows (in thousands):
|  | December 31, 2017
Stock options outstanding |  | 4,047 |
Restricted stock units outstanding |  | 2,033 |
Shares available for future grant under 2014 Plan |  | 7,300 |
Shares available for future issuance under ESPP |  | 1,371 |
Common stock warrants outstanding |  | 13 |
Total shares of common stock reserved |  | 14,764 |
Schedule of Stock Option Activities | A summary of the Company’s stock option activity during the year ended December 31, 2017 is as follows (in thousands, except years and per share data):
|  | Number of Shares |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life (Years) |  | Aggregate Intrinsic Value (1)
Outstanding as of December 31, 2016 |  | 5,556 |  |  | $ | 5.23 |  |  |  |  |
Options granted |  | 619 |  |  | 18.11 |  |  |  |  |
Options exercised |  | (1,986 | ) |  | 3.04 |  |  |  |  |
Options forfeited or expired |  | (142 | ) |  | 12.83 |  |  |  |  |
Outstanding as of December 31, 2017 |  | 4,047 |  |  | $ | 8.00 |  |  | 6.4 |  | 68,334 |
Vested and expected to vest as of December 31, 2017 |  | 4,047 |  |  | 8.00 |  |  | 6.4 |  | 68,334 |
Exercisable as of December 31, 2017 |  | 2,911 |  |  | 6.20 |  |  | 5.6 |  | 54,380 |
(1) The aggregate intrinsic value amounts are computed based on the difference between the exercise price of the stock options and the fair market value of the Company’s common stock of $24.88 per share as of December 31, 2017 for all in-the-money stock options outstanding.
Following is additional information pertaining to the Company’s stock option activity (in thousands, except per share data):
|  | Year Ended December 31,
|  | 2017 |  | 2016 |  | 2015
Weighted average grant date fair value per share of options granted |  | $ | 8.81 |  |  | $ | 4.50 |  |  | $ | 2.38 |
Intrinsic value of options exercised (1) |  | 33,820 |  |  | 5,865 |  |  | 3,233 |
Total fair value of options vested during the period |  | 7,296 |  |  | 3,813 |  |  | 4,824 |
Cash received from options exercised |  | 6,047 |  |  | 4,286 |  |  | 1,268 |
(1) Intrinsic value of options exercised is the difference between the fair market value of the Company’s common stock at the time of exercise and the exercise price paid.
Schedule of RSU Activities | A summary of RSU activity during the year ended December 31, 2017 is as follows (in thousands, except years and per share data):
|  | Number of Shares |  | Weighted Average Grant Date Fair Value Per Share
Outstanding as of December 31, 2016 |  | 2,019 |  |  | $ | 7.65 |
RSUs granted |  | 1,176 |  |  | 18.29 |
RSUs vested and released |  | (971 | ) |  | 8.85 |
RSUs forfeited |  | (191 | ) |  | 11.42 |
Outstanding as of December 31, 2017 |  | 2,033 |  |  | $ | 12.81 |
Following is additional information pertaining to the Company’s RSU activity (in thousands, except per share data):
|  | Year Ended December 31,
|  | 2017 |  | 2016 |  | 2015
Weighted average grant date fair value per share of RSUs granted |  | $ | 18.29 |  |  | $ | 9.71 |  |  | $ | 5.10 |
Total fair value of RSUs vested during the period |  | 21,161 |  |  | 10,706 |  |  | 2,907 |
Schedule of Stock-based Compensation Expense | Stock-based compensation expenses for the years ended December 31, 2017, 2016 and 2015 were as follows (in thousands):
|  | Year Ended December 31,
|  | 2017 |  | 2016 |  | 2015
Cost of revenue |  | $ | 2,202 |  |  | $ | 1,375 |  |  | $ | 866 |
Research and development |  | 3,042 |  |  | 2,059 |  |  | 1,790 |
Sales and marketing |  | 4,364 |  |  | 2,363 |  |  | 1,800 |
General and administrative (1) |  | 5,735 |  |  | 3,846 |  |  | 3,274 |
Total stock-based compensation |  | $ | 15,343 |  |  | $ | 9,643 |  |  | $ | 7,730 |
(1) | Effective December 2017, the Company’s former Chief Executive Officer and President resigned from his position and became the Executive Chairman of the Board. Due to this substantive change in status, certain of his stock option and RSU awards were modified which resulted in incremental stock based compensation expense of approximately $1.0 million.
Schedule of Unrecognized Compensation Expense | As of December 31, 2017, unrecognized stock-based compensation expense by award type and their expected weighted-average recognition periods are summarized in the following table (in thousands, except years).
|  | Stock Option |  | RSU |  | ESPP
Unrecognized stock-based compensation expense |  | $ | 10,703 |  |  | $ | 26,401 |  |  | $ | 670 |
Weighted-average amortization period |  | 2.5 years |  |  | 2.8 years |  |  | 0.4 years |
Schedule of Valuation Assumptions, Stock Option | The weighted-average assumptions used to value stock options and purchase rights under the ESPP granted during the years ended December 31, 2017, 2016 and 2015 were as follows:
Stock Options |  | Year Ended December 31,
|  | 2017 |  | 2016 |  | 2015
Expected term (years) |  | 5.9 |  | 5.7 |  | 6.1
Volatility |  | 49% |  | 46% |  | 49%
Risk-free interest rate |  | 2.1% |  | 1.4% |  | 1.6%
Dividend yield |  | — |  | — |  | —
Schedule of Valuation Assumptions for Employee Stock Purchase Plan |
ESPP |  | Granted In
|  | November 2017 |  | May 2017 |  | November 2016 |  | May 2016 |  | November 2015 |  | May 2015
Expected term (years) |  | 0.5 |  | 0.5 |  | 0.5 |  | 0.5 |  | 0.5 |  | 0.5
Volatility |  | 36% |  | 43% |  | 42% |  | 58% |  | 54% |  | 43%
Risk-free interest rate |  | 1.4% |  | 1.0% |  | 0.6% |  | 0.4% |  | 0.3% |  | 0.1%
Dividend yield |  | — |  | — |  | — |  | — |  | — |  | —

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