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Stockholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2021
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Stock-based Compensation Expense Included in Operating Expense | Stock-based compensation expense was included in the following operating expense categories as follows (in thousands):
|  | Nine Months Ended September 30, |  |  | Three Months Ended September 30, |
|  | 2020 |  |  | 2021 |  |  | 2020 |  |  | 2021 |
Service costs |  | $ | 29 |  |  | $ | 15 |  |  | $ | 7 |  |  | $ | 3 |
Sales and marketing |  |  | 758 |  |  |  | 663 |  |  |  | 247 |  |  |  | 213 |
Product development |  |  | 261 |  |  |  | 230 |  |  |  | 90 |  |  |  | 45 |
General and administrative |  |  | 1,576 |  |  |  | 1,099 |  |  |  | 473 |  |  |  | 347 |
Total stock-based compensation |  | $ | 2,624 |  |  | $ | 2,007 |  |  | $ | 817 |  |  | $ | 608 |
Assumptions to Estimate Fair Value for Stock Options at Grant Date | The following weighted average assumptions were used in determining the fair value of time-vested stock option grants for the periods presented:
|  | Nine Months Ended September 30, |  | Three Months Ended September 30,
|  | 2020 |  | 2021 |  | 2020 |  |  | 2021
Expected life (in years) |  | 4.0 - 6.25 |  | 4.0 - 6.25 |  | 4.0 |  |  | 4.0 - 6.25
Risk-free interest rate |  | 0.17%-1.22% |  | 0.64%-1.16% |  |  | 0.22 | % |  | 0.76%-1.15%
Expected volatility |  | 46%-53% |  | 50%-58% |  |  | 53 | % |  | 50-58%
Summary of Stock Option | Stock option activity during the nine months ended September 30, 2021 is summarized as follows:
|  | Shares (in thousands) |  |  | Weighted average exercise price |  |  | Weighted average remaining contractual term (in years) |
Balance at December 31, 2020 |  |  | 3,460 |  |  | $ | 3.82 |  |  |  | 6.50 |
Options granted |  |  | 527 |  |  |  | 2.46 |  |  |  |  |
Options forfeited |  |  | (159 | ) |  |  | 3.35 |  |  |  |  |
Options expired |  |  | (227 | ) |  |  | 4.97 |  |  |  |  |
Options exercised |  |  | (69 | ) |  |  | 2.64 |  |  |  |  |
Balance at September 30, 2021 |  |  | 3,532 |  |  | $ | 3.59 |  |  |  | 6.02 |
Summary of Restricted Stock Awards and Restricted Stock Units | Restricted stock awards and restricted stock unit activity during the nine months ended September 30, 2021 is summarized as follows:
|  | Shares/ Units (in thousands) |  |  | Weighted average grant date fair value |
Unvested balance at December 31, 2020 |  |  | 1,632 |  |  | $ | 3.18 |
Granted |  |  | 194 |  |  |  | 2.10 |
Vested |  |  | (214 | ) |  |  | 3.05 |
Forfeited |  |  | (224 | ) |  |  | 2.88 |
Unvested balance at September 30, 2021 |  |  | 1,388 |  |  | $ | 3.10 |

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + 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=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 S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=122041274&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=120381028&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=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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- 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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