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Stockholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 2018
Equity [Abstract] |
Schedule of Common Stock Reserved for Future Issuance | Shares of common stock reserved for future issuance related to outstanding equity awards, common stock warrants, and employee equity incentive plans were as follows (in thousands):
|  | June 30, 2018
Stock options outstanding |  | 3,333 |
Restricted stock units outstanding |  | 2,705 |
Shares available for future grant under 2014 Plan |  | 8,666 |
Shares available for future issuance under ESPP |  | 1,801 |
Common stock warrants outstanding |  | 13 |
Total shares of common stock reserved |  | 16,518 |
Schedule of Stock Option Activity | A summary of the Company’s stock option activity during the six months ended June 30, 2018 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
Outstanding as of December 31, 2017 |  | 4,047 |  |  | $ | 8.00 |  |  |  |  |
Options granted (weighted average grant date fair value of $14.14 per share) |  | 268 |  |  | 30.37 |  |  |  |  |
Options exercised |  | (974 | ) |  | 5.93 |  |  |  |  |
Options forfeited or expired |  | (8 | ) |  | 4.68 |  |  |  |  |
Outstanding as of June 30, 2018 |  | 3,333 |  |  | $ | 10.41 |  |  | 6.4 |  | $ | 80,524 |
Schedule of RSU Activity | A summary of the Company’s restricted stock unit (“RSU”) activity during the six months ended June 30, 2018 is as follows (in thousands, except per share data):
|  | Number of Shares |  | Weighted Average Grant Date Fair Value Per Share
Outstanding as of December 31, 2017 |  | 2,033 |  |  | $ | 12.81 |
RSUs granted |  | 1,285 |  |  | 30.51 |
RSUs vested and released |  | (534 | ) |  | 12.25 |
RSUs forfeited |  | (79 | ) |  | 17.64 |
Outstanding as of June 30, 2018 |  | 2,705 |  |  | $ | 21.18 |
Schedule of Stock-based Compensation Expense | Stock-based compensation expenses were as follows (in thousands):
|  | Three Months Ended |  | Six Months Ended
|  | June 30, 2018 |  | June 30, 2017 |  | June 30, 2018 |  | June 30, 2017
Cost of revenue |  | $ | 853 |  |  | $ | 575 |  |  | $ | 1,531 |  |  | $ | 1,009 |
Research and development |  | 1,064 |  |  | 801 |  |  | 1,941 |  |  | 1,438 |
Sales and marketing |  | 1,585 |  |  | 1,224 |  |  | 2,947 |  |  | 2,152 |
General and administrative |  | 3,295 |  |  | 1,254 |  |  | 5,703 |  |  | 2,384 |
Total stock-based compensation |  | $ | 6,797 |  |  | $ | 3,854 |  |  | $ | 12,122 |  |  | $ | 6,983 |
Schedule of Unrecognized Compensation Expense | As of June 30, 2018, unrecognized stock-based compensation expenses 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 |  | $ | 11,366 |  |  | $ | 56,023 |  |  | $ | 708 |
Weighted-average amortization period |  | 2.6 years |  |  | 3.0 years |  |  | 0.4 years |
Schedule of Valuation Assumptions, Stock Option | The weighted-average assumptions used to value stock options granted during the periods presented were as follows:
Stock Options |  | Three Months Ended |  | Six Months Ended
|  | June 30, 2018 |  | June 30, 2017 |  | June 30, 2018 |  | June 30, 2017
Expected term (years) |  | 6.1 |  |  | 6.1 |  |  | 6.0 |  | 6.2
Volatility |  | 44 | % |  | 49 | % |  | 45% |  | 49%
Risk-free interest rate |  | 2.7 | % |  | 2.0 | % |  | 2.7% |  | 2.0%
Dividend yield (1) |  | — |  |  | — |  |  | — |  | —
(1) | The Company has not paid, and does not anticipate paying, cash dividends on its shares of common stock. Accordingly, the expected dividend yield is zero.

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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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