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Stock-Based Compensation and Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2021
Equity [Abstract] |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions | The following table sets forth the weighted-average stock option fair values and assumptions:
| Years Ended December 31,
| 2021 |  | 2020 |  | 2019
Weighted-average fair value | N/A |  | $ | 6.97 |  |  | $ | 10.24 |
Dividend yield | N/A |  | — |  |  | — |
Volatility | N/A |  | 52.06 | % |  | 39.37 | %
Risk-free interest rate | N/A |  | 0.30 | % |  | 1.68 | %
Expected life (in years) | N/A |  | 4.82 |  | 4.47
Schedule of Stock Option Activity | The following tables reflect changes in the Company's outstanding stock-based compensation awards for the years ended December 31, 2021 and 2020:
| 2021
| Number of Stock Option Awards |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Term (years) |  | Aggregate Intrinsic Value (in thousands)
Outstanding stock option awards at January 1 | 4,278,160 |  |  | $ | 11.20 |  |  | 8.36 |  | $ | 9,855 |
Granted | — |  |  | — |  |  | — |  | — |
Exercises (net cash settled) | — |  |  | — |  |  | — |  | — |
Exercises (issuance of shares) | (446,344) |  |  | 7.69 |  |  | 5.91 |  | 8,459 |
Forfeitures/expirations | (98,002) |  |  | 13.01 |  |  | 8.52 |  | 2,078 |
Outstanding stock option awards as of December 31, 2021 | 3,733,814 |  |  | $ | 11.59 |  |  | 7.52 |  | $ | 110,298 |
Options exercisable as of December 31 | 1,293,492 |  |  | $ | 8.61 |  |  | 6.78 |  | $ | 42,060 |
| 2020
| Number of Stock Option Awards |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Term (years) |  | Aggregate Intrinsic Value (in thousands)
Outstanding stock option awards at January 1 | 5,875,829 |  |  | $ | 9.29 |  |  | 8.15 |  | $ | 42,434 |
Granted | 872,003 |  |  | 11.90 |  |  | 9.87 |  | 1,393 |
Exercises (net cash settled) | (130,017) |  |  | 3.68 |  |  | 5.74 |  | 896 |
Exercises (issuance of shares) | (2,143,317) |  |  | 3.69 |  |  | 5.77 |  | 15,511 |
Forfeitures/expirations | (196,338) |  |  | 13.22 |  |  | 8.64 |  | (146) |
Outstanding stock option awards at December 31, 2020 | 4,278,160 |  |  | $ | 11.20 |  |  | 8.36 |  | $ | 9,855 |
Options exercisable as of December 31 | 992,061 |  |  | $ | 4.28 |  |  | 5.81 |  | $ | 9,151 |
Share-based Payment Arrangement, Cost by Plan | The following table sets forth stock-based compensation expense (benefit), including the effects of gains and losses from changes in fair value during the years ended December 31, 2021, 2020 and 2019, recognized by the Company in the following line items in the Company's consolidated statements of operations and comprehensive income during the periods presented:
| Years Ended December 31,
(in thousands) | 2021 |  | 2020 |  | 2019
Cost of services | $ | 380 |  |  | $ | (72) |  |  | $ | 381 |
Sales and marketing | 3,490 |  |  | 266 |  |  | 1,649 |
General and administrative | 4,224 |  |  | (3,089) |  |  | 12,089 |
Stock-based compensation expense (benefit) | $ | 8,094 |  |  | $ | (2,895) |  |  | $ | 14,119 |

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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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