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Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock-based compensation expense | Stock-based compensation expense included in the consolidated statements of operations and comprehensive loss was as follows:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
(in thousands) | 2018 |  | 2017 |  | 2018 |  | 2017
Cost of revenue | $ | 692 |  |  | $ | 63 |  |  | $ | 883 |  |  | $ | 167 |
Sales and marketing | 2,707 |  |  | 409 |  |  | 3,984 |  |  | 1,037 |
Research and development | 2,427 |  |  | 510 |  |  | 3,594 |  |  | 1,356 |
General and administrative | 2,957 |  |  | 1,046 |  |  | 5,745 |  |  | 2,943 |
Total stock-based compensation expense | $ | 8,783 |  |  | $ | 2,028 |  |  | $ | 14,206 |  |  | $ | 5,503 |
Stock option activity | A summary of our stock option activity is presented below:
(in thousands, except for per share data and years) | Number of Shares |  | Weighted Average Exercise Price |  | Weighted-Average Remaining Contractual Term (in years) |  | Aggregate Intrinsic Value
Outstanding at December 31, 2017 | 14,573 |  | $ | 4.38 |  |  | 8.2 |  | $ | 77,020 |
Granted | 6,108 |  | 15.17 |  |  |  |  |  |
Exercised | (654) |  | 2.16 |  |  |  |  |  |
Forfeited/canceled | (640) |  | 6.81 |  |  |  |  |  |
Outstanding at September 30, 2018 | 19,387 |  | 7.77 |  |  | 8.2 |  | 603,127 |
Exercisable at September 30, 2018 | 5,855 |  | 3.55 |  |  | 6.7 |  | 206,850 |
Stock option valuation assumptions | The fair value of each stock option was estimated on the grant date based on the following assumptions:
| Nine Months Ended September 30, 2018
Expected term (in years) | 6.3
Expected volatility | 41.3% — 43.3%
Risk-free interest rate | 2.7% — 2.9%
Expected dividend yield | —
Summary of restricted stock and restricted stock units | A summary of our restricted stock and restricted stock units activity is presented below:
| Restricted Stock |  | Restricted Stock Units
(in thousands, except for per share data and years) | Number of Shares |  | Weighted Average Grant Date Fair Value |  | Number of Shares |  | Weighted Average Grant Date Fair Value
Unvested balance at December 31, 2017 | 1,583 |  |  | $ | 4.25 |  |  | — |  |  | $ | — |
Granted | — |  |  | — |  |  | 1,097 |  |  | 17.82 |
Vested | (594) |  |  | 4.25 |  |  | — |  |  | — |
Forfeited | — |  |  | — |  |  | (47) |  |  | 16.22 |
Unvested balance at September 30, 2018 | 989 |  |  | 4.25 |  |  | 1,050 |  |  | 17.89 |

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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + 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 + 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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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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