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Stock-Based Compensation (Recognized Stock-Based Compensation Expense) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total stock-based compensation expense | $ 1,532 | $ 929 | $ 4,713 | $ 2,822
Unrecognized compensation expense | 14,100 |  | $ 14,100 |
Weighted average period |  |  | 2 years 6 months |
Stock options |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total stock-based compensation expense | 1,419 | 866 | $ 4,403 | 2,657
ESPP |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total stock-based compensation expense | 113 | 63 | 310 | 165
Selling, general & administrative |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total stock-based compensation expense | 1,290 | 785 | 3,728 | 2,402
Research & development |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total stock-based compensation expense | 221 | 132 | 927 | 367
Cost of goods sold |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total stock-based compensation expense | $ 21 | $ 12 | $ 58 | $ 53

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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