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Stock-Based Compensation - Changes in stock options (Details) - USD ($) $ / shares in Units, $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2024 | Dec. 31, 2023
Employee Stock Option |  |
Number of shares |  |
Outstanding Options at beginning of period (in shares) | 740,439 |
Exercised (in shares) | (348,389) |
Vested and expired (in shares) | (29,941) |
Outstanding Options at end of period (in shares) | 362,109 | 740,439
Exercisable Options at end of period (in shares) | 362,109 |
Weighted Average Exercise Price per Share |  |
Outstanding Options at beginning of period (in dollars per share) | $ 6.55 |
Exercised (in dollars per share) | 5.31 |
Vested and expired (in dollars per share) | 10.83 |
Outstanding Options at end of period (in dollars per share) | $ 7.38 | $ 6.55
Weighted Average Contractual Life (Years) |  |
Outstanding Options (in years) | 5 years 25 days | 5 years 2 months 1 day
Intrinsic Value |  |
Outstanding Options at Beginning of period | $ 2,570 |
Exercised | 1,620 |
Outstanding Options at End of period | $ 646 | $ 2,570
Stock Appreciation Rights (SARs) |  |
Number of shares |  |
Outstanding Options at beginning of period (in shares) | 714,539 |
Exercised (in shares) | (714,539) |
Outstanding Options at end of period (in shares) | 0 | 714,539
Exercisable Options at end of period (in shares) | 0 |
Weighted Average Exercise Price per Share |  |
Outstanding Options at beginning of period (in dollars per share) | $ 1.82 |
Exercised (in dollars per share) | $ 1.82 |
Outstanding Options at end of period (in dollars per share) |  | $ 1.82
Weighted Average Contractual Life (Years) |  |
Outstanding Options (in years) |  | 7 years 2 months 1 day

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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