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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2020
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 (in thousands):
|  | Years ended December 31, |
|  | 2019 |  |  | 2020 |
Service costs |  | $ | 113 |  |  | $ | 36 |
Sales and marketing |  |  | 469 |  |  |  | 1,041 |
Product development |  |  | 233 |  |  |  | 358 |
General and administrative |  |  | 2,000 |  |  |  | 2,172 |
Total stock-based compensation |  | $ | 2,815 |  |  | $ | 3,607 |
Assumptions to Estimate Fair Value for Stock Options at Grant Date | The following assumptions were used in determining the fair value of time-vested stock options granted for the periods indicated:
|  | Years ended December 31,
|  | 2019 |  | 2020
Expected life (in years) |  | 4.00-6.25 |  | 4.00-6.25
Risk-free interest rate |  | 1.57% - 2.22% |  | 0.17% - 1.22%
Expected volatility |  | 39% to 50% |  | 46% - 54%
Weighted average expected volatility |  | 38% |  | 52%
Stock Option, Restricted Stock Award, and Restricted Stock Unit Activity | Stock option, restricted stock award, and restricted stock unit activity during the period is as follows:
|  | Options and Restricted Stock available for grant (in thousands) |  |  | Number of options outstanding (in thousands) |  |  | Weighted average exercise price of options |  |  | Weighted average remaining contractual term (in years) |  |  | Aggregate intrinsic value (in thousands) |
Balance at December 31, 2019 |  |  | 11,566 |  |  |  | 4,782 |  |  | $ | 4.80 |  |  |  | 5.82 |  |  | $ | 1,585 |
Increase to pool January 1, 2020 |  |  | 2,214 |  |  |  | — |  |  |  |  |  |  |  |  |  |  |  |  |
Options granted |  |  | (760 | ) |  |  | 760 |  |  | $ | 2.29 |  |  |  |  |  |  |  |  |
Restricted stock granted |  |  | (560 | ) |  |  | — |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock forfeited |  |  | 21 |  |  |  | — |  |  |  |  |  |  |  |  |  |  |  |  |
Options exercised |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |  |  |  |  |
Options cancelled |  |  | 1,472 |  |  |  | (1,472 | ) |  |  | 5.81 |  |  |  |  |  |  |  |  |
Options expired |  |  | 477 |  |  |  | (477 | ) |  | $ | 5.12 |  |  |  |  |  |  |  |  |
Options forfeited |  |  | 133 |  |  |  | (133 | ) |  | $ | 3.48 |  |  |  |  |  |  |  |  |
Balance at December 31, 2020 |  |  | 14,563 |  |  |  | 3,460 |  |  | $ | 3.82 |  |  |  | 6.50 |  |  | $ | 27 |
Options exercisable at December 31, 2020 |  |  |  |  |  |  | 1,934 |  |  | $ | 4.51 |  |  |  | 5.10 |  |  | $ | — |
Information Related to Stock Compensation Activity | Information related to stock compensation activity during the period indicated is as follows:
|  | Years ended December 31, |
|  | 2019 |  |  | 2020 |
Weighted average fair value of options granted |  | $ | 1.62 |  |  | $ | 1.08 |
Intrinsic value of options exercised (in thousands) |  | $ | 496 |  |  | $ | - |
Total grant date fair value of restricted stock vested (in thousands) |  | $ | 1,545 |  |  | $ | 2,666 |
Summary of Restricted Stock Awards and Restricted Stock Units | Restricted stock awards and restricted stock unit activity during the period is as follows:
|  | Shares/ Units (in thousands) |  |  | Weighted Average Grant Date Fair Value |
Unvested at December 31, 2019 |  |  | 1,786 |  |  | $ | 3.70 |
Granted |  |  | 560 |  |  |  | 2.26 |
Vested |  |  | (693 | ) |  |  | 3.79 |
Forfeited |  |  | (21 | ) |  |  | 2.72 |
Unvested at December 31, 2020 |  |  | 1,632 |  |  |  | 3.18 |

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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=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=120381028&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure of activity for award under share-based payment arrangement. Includes, but is not limited to, outstanding award at beginning and end of year, granted, exercised, forfeited, 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 (e) -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 (c)(2) -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 (d) -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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