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STOCK-BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 31, 2022
Summary of information related to stock-based incentive compensation plans | ​
​ | ​ | ​
​ | ​ | ​
​ | ​ | December 31, 2022
Shares available for future issuance under the 2017 Omnibus Incentive Plan | ​ | 1,475
Shares available for future issuance under the Employee Stock Purchase Plan | ​ | 619
​
Schedule of stock-based compensation | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years Ended December 31,
​ |  | 2022 |  | 2021 |  | 2020
Stock-based compensation expense | ​ | $ | 19,849 | ​ | $ | 15,739 | ​ | $ | 12,272
​
Schedule of changes in unvested RSUs | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, 2022
​ |  | ​ |  | Weighted-
​ | ​ | ​ | ​ | Average
​ | ​ | Number of | ​ | Grant Date
​ | ​ | RSUs | ​ | Fair Value
RSUs outstanding at beginning of period |  | 627 | ​ | $ | 76.37
RSUs granted |  | 593 | ​ | $ | 74.62
RSUs vested |  | (162) | ​ | $ | 83.16
RSUs forfeited |  | (255) | ​ | $ | 61.39
RSUs outstanding at end of period |  | 803 | ​ | $ | 78.46
​
Summary of changes in stock options | Changes in our stock options were as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, 2022 | ​ | ​
​ |  | ​ |  | Weighted- |  | Weighted-
​ | ​ | ​ | ​ | Average | ​ | Average
​ | ​ | Number of | ​ | Exercise Price | ​ | Remaining
​ | ​ | Options | ​ | per Share | ​ | Contractual Life
Options outstanding at beginning of period |  | 112 | ​ | $ | 24.41 | ​ | ​
Options granted |  | 76 | ​ | $ | 85.97 | ​ | ​
Options exercised |  | (37) | ​ | $ | 23.26 | ​ | ​
Options outstanding at end of period |  | 151 | ​ | $ | 55.48 | ​ | 5.63 years
Options vested at end of period |  | 75 | ​ | $ | 24.97 | ​ | 2.04 years
​
Stock Option |
Schedule of stock-based compensation | ​
​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, | ​
Stock Options |  | 2022 |
Risk-free interest rate |  | 2.18 | %
Expected dividend yield rate |  | 0.5 | %
Expected term |  | 4.7 years |
Expected volatility |  | 48.6 | %
Weighted average grant date fair value of options granted | ​ | $ 35.84 | ​
​
Employee Stock |
Schedule of stock-based compensation | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years Ended December 31, | ​
ESPP |  | 2022 |  | 2021 |  | 2020 |
Risk-free interest rates |  | 1.63% - 4.65% | % | 0.04% - 0.10 | % | 0.10% - 0.18% | %
Expected dividend yield rate |  | 0.1 | % | — | % | — | %
Expected term |  | 0.5 years |  | 0.5 years |  | 0.5 years | ​
Expected volatility |  | 43.7 | % | 42.7 | % | 70.1 | %

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- Definition The entire disclosure for an entity's employee compensation and benefit plans, including, but not limited to, postemployment and postretirement benefit plans, defined benefit pension plans, defined contribution plans, non-qualified and supplemental benefit plans, deferred compensation, share-based compensation, life insurance, severance, health care, unemployment and other benefit plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI https://asc.fasb.org/topic&trid=2228938 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 712 -URI https://asc.fasb.org/topic&trid=2197446 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -URI https://asc.fasb.org/topic&trid=2127225 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI https://asc.fasb.org/topic&trid=2235017 + Details
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