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STOCK-BASED COMPENSATION (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of stock-based compensation | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended March 31,
​ |  | 2021 |  | 2020
Stock-based compensation expense | ​ | $ | 5,701 | ​ | $ | 3,048
Summary of stock option activity | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended March 31, 2021
​ |  | ​ |  | Weighted-
​ | ​ | ​ | ​ | Average
​ | ​ | Number of | ​ | Grant Date
​ | ​ | RSUs | ​ | Fair Value
RSUs outstanding at beginning of period |  | 608 | ​ | $ | 58.15
RSUs granted |  | 227 | ​ | $ | 93.93
RSUs vested |  | (125) | ​ | $ | 58.18
RSUs forfeited |  | (110) | ​ | $ | 65.70
RSUs outstanding at end of period |  | 600 | ​ | $ | 70.37
Restricted Stock Units (RSUs) [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Summary of stock option activity | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended March 31, 2021
​ |  | ​ |  | Weighted-
​ | ​ | ​ | ​ | Average
​ | ​ | Number of | ​ | Exercise Price
​ | ​ | Options | ​ | per Share
Options outstanding at beginning of period |  | 147 | ​ | $ | 23.63
Options exercised |  | (13) | ​ | $ | 20.52
Options expired |  | — | ​ | $ | ​
Options outstanding at end of period |  | 134 | ​ | $ | 23.92

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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