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STOCK-BASED COMPENSATION (Tables) | 9 Months Ended
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Sep. 30, 2023
STOCK-BASED COMPENSATION |
Summary of information related to stock-based incentive compensation plans | ​
​ | ​ | ​
​ | ​ | September 30, 2023
Shares available for future issuance under the 2023 Plan | ​ | 2,318
Shares available for future issuance under the ESPP | ​ | 598
Schedule of stock-based compensation | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended September 30, | ​ | Nine Months Ended September 30,
​ |  | 2023 |  | 2022 |  | 2023 |  | 2022
Stock-based compensation expense | ​ | $ | 8,075 | ​ | $ | 6,022 | ​ | $ | 22,813 | ​ | $ | 15,008
Summary of changes in RSUs | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Nine Months Ended September 30, 2023
​ |  | ​ |  | Weighted-
​ | ​ | ​ | ​ | Average
​ | ​ | Number of | ​ | Grant Date
​ | ​ | RSUs | ​ | Fair Value
RSUs outstanding at beginning of period |  | 803 | ​ | $ | 78.46
RSUs granted |  | 397 | ​ | $ | 100.15
RSUs vested |  | (203) | ​ | $ | 85.60
RSUs forfeited |  | (51) | ​ | $ | 78.35
RSUs outstanding at end of period |  | 946 | ​ | $ | 85.91
Summary of changes in stock options | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Nine Months Ended September 30, 2023 | ​
​ |  | ​ |  | Weighted- |
​ | ​ | ​ | ​ | Average | ​
​ | ​ | Number of | ​ | Exercise Price | ​
​ | ​ | Options | ​ | per Share | ​
Options outstanding at beginning of period |  | 151 | ​ | $ | 55.48 | ​
Options exercised |  | (62) | ​ | $ | 24.67 | ​
Options outstanding at end of period |  | 89 | ​ | $ | 76.69 | ​
​

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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 -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure of number, weighted-average exercise price or conversion ratio, aggregate intrinsic value, and weighted-average remaining contractual term for outstanding restricted stock units that are fully vested and expected to vest. Includes, but is not limited to, unvested restricted stock units for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Subparagraph (e)(1) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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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 -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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