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Stock-Based Compensation (Tables) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Share-based Payment Arrangement [Abstract] |  |
Stock-based Compensation Expense | The following table shows stock-based compensation expense by where the stock-based compensation expense is recorded in the Company’s unaudited condensed consolidated statement of operations:
| Three Months Ended September 30, | Nine Months Ended September 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Cost of revenue | $ | 7 |  |  | $ | 5 |  |  | $ | 22 |  |  | $ | 14 |
Sales and marketing | 100 |  |  | 36 |  |  | 245 |  |  | 100 |
Research and development | 68 |  |  | 29 |  |  | 204 |  |  | 86 |
General and administrative | 452 |  |  | 188 |  |  | 1,318 |  |  | 472 |
Total stock-based compensation | $ | 627 |  |  | $ | 258 |  |  | $ | 1,789 |  |  | $ | 672 |
| The following table shows stock-based compensation expense by where the stock-based compensation expense is recorded in the Company’s consolidated statement of operations:
| For the Year Ended December 31,
| 2019 |  | 2020
Cost of revenue | $ | 9 |  |  | $ | 18 |
Sales and marketing | 53 |  |  | 166 |
Research and development | 58 |  |  | 113 |
General and administrative | 384 |  |  | 782 |
Total stock-based compensation | $ | 504 |  |  | $ | 1,079 |
Weighted-Average Assumptions to Determine Fair Value | The weighted-average assumptions utilized to determine the fair value of options granted to employees are presented in the following table:
| Three Months Ended September 30, | Nine Months Ended September 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Expected volatility | N/A |  | 52.0 | % |  | 52.0 | % |  | 49.7 | %
Weighted-average risk-free interest rate | N/A |  | 0.33 | % |  | 1.04 | % |  | 0.80 | %
Expected dividend yield | N/A |  | — |  |  | — |  |  | — |
Expected life – in years | N/A |  | 6 |  | 6 |  | 6
| The weighted-average assumptions utilized to determine the fair value of options granted to employees are presented in the following table:
| Year Ended December 31,
| 2019 |  | 2020
Expected volatility | 45.7 | % |  | 51.0 | %
Weighted-average risk-free interest rate | 1.92 | % |  | 0.71 | %
Expected dividend yield | — |  |  | — |
Expected life – in years | 6 |  | 6
Summary of Option Activity | A summary of the Company’s option activity as of September 30, 2021, which all occurred under the 2019 Plan and the 2021 Plan, and changes during the nine months then ended are as follows:
| Number of Options |  | Weighted-Average Exercise Price (per share) |  | Weighted-Average Remaining Contractual Term (in years)
Outstanding at December 31, 2020 | 7,611,258 |  |  | $ | 1.37 |  |  | 8.40
Granted | 229,053 |  |  | 12.37 |  |  |
Exercised | (577,153) |  |  | 1.18 |  |  |
Forfeited | (198,213) |  |  | 2.35 |  |  |
Outstanding at September 30, 2021 | 7,064,945 |  |  | 1.72 |  |  | 7.84
Options exercisable at September 30, 2021 | 3,346,067 |  |  | 1.02 |  | 7.99
| A summary of option activity under the Plan as of December 31, 2020, and changes during the year then ended are as follows:
| Number of Options |  | Weighted-Average Exercise Price (per share) |  | Weighted-Average Remaining Contractual Term (in years)
Outstanding at December 31, 2019 | 5,963,100 |  |  | $ | 1.00 |  |  | 9.04
Granted | 2,181,900 |  |  | 2.22 |  |  |
Exercised | (457,341) |  |  | 0.55 |  |  |
Forfeited | (76,401) |  |  | 1.23 |  |  |
Outstanding at December 31, 2020 | 7,611,258 |  |  | 1.37 |  |  | 8.40
Options exercisable at December 31, 2020 | 2,804,358 |  |  | 0.87 |  | 7.60
Summary of Restricted Stock Unit Activity | A summary of RSU activity under the Company’s 2021 Plan for the nine months ended September 30, 2021 is as follows:
|  | Number of Shares |  | Weighted-Average Grant Date Fair Value |  | Aggregate Fair Value
Unvested balance at January 1, 2021 |  | — |  | — |  |
Granted |  | 164,487 |  | 11.48 |  | $ | 1,888 |
Vested |  | — |  | — |  |
Forfeited |  | — |  | — |  |
Unvested balance as of September 30, 2021 |  | 164,487 |  | 11.48 |  |

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&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=120381028&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=120381028&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=120381028&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=120381028&loc=d3e5070-113901 + Details
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