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Stock-Based Compensation Expense (Tables) | 12 Months Ended
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Dec. 31, 2022
Effect of Recording Stock-Based Compensation Expense | The effect of recording stock-based compensation ("SBC") expense for continuing operations for the years ended December 31, 2022, 2021 and 2020 is as follows (in thousands):
|  | Years Ended December 31, |
|  | 2022 |  |  | 2021 |  |  | 2020 |
Research and development |  | $ | 1,644 |  |  | $ | 1,895 |  |  | $ | 2,189 |
Selling, general and administrative |  |  | 21,201 |  |  |  | 23,733 |  |  |  | 17,954 |
Total stock-based compensation expense |  | $ | 22,845 |  |  | $ | 25,628 |  |  | $ | 20,143 |
Employee Stock Purchase Plan |
Schedule of Assumptions Used to Value Options Granted | The following assumptions were used to value the ESPP shares:
|  | Years Ended December 31, |
|  | 2022 |  |  | 2021 |  |  | 2020 |
Expected life (years) |  |  | 2.0 |  |  |  | 2.0 |  |  |  | 2.0 |
Risk-free interest rate |  | 1.3 - 4.3% |  |  | 0.1 - 0.2% |  |  | 0.1 - 1.4% |
Dividend yield |  | 1.1 - 2.3% |  |  | 0.9 - 1.2% |  |  | 1.4 - 4.0% |
Expected volatility |  | 48.5 - 69.0% |  |  | 52.0 - 52.0% |  |  | 45.8 - 57.5% |
Performance Stock Units |
Schedule of Assumptions Used to Value Options Granted | The following assumptions were used to value the performance stock awards subject to market conditions granted in the years ended December 31, 2022, 2021 and 2020:
|  | Years Ended December 31, |
|  | 2022 |  |  | 2021 |  |  | 2020 |
Expected life (in years) |  |  | 3.0 |  |  |  | 3.0 |  |  |  | 3.0 |
Risk-free interest rate |  |  | 2.8 | % |  |  | 0.3 | % |  |  | 0.2 | %
Dividend yield |  |  | 1.2 | % |  |  | 1.0 | % |  |  | 1.4 | %
Expected volatility |  | 37.5% - 40.9% |  |  |  | 47.9 | % |  |  | 51.3 | %

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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 https://asc.fasb.org/extlink&oid=128089324&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 https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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