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STOCK-BASED COMPENSATION (Tables) | 9 Months Ended
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Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of stock-based compensation | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended September 30, | ​ | Nine Months Ended September 30, | ​
​ |  | 2020 |  | 2019 |  | 2020 |  | 2019 | ​
Stock-based compensation expense | ​ | $ | 3,781 | ​ | $ | 917 | ​ | $ | 9,666 | ​ | $ | 5,053 | ​
Summary of stock option activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Nine Months Ended September 30, 2020 | ​
​ |  | ​ |  | Weighted- | ​
​ | ​ | ​ | ​ | Average | ​
​ | ​ | ​ | ​ | Grant Date | ​
​ | ​ | Number of RSUs | ​ | Fair Value | ​
RSUs outstanding at beginning of period |  | 534 | ​ | $ | 56.56 |
RSUs granted |  | 336 | ​ | $ | 59.33 |
RSUs vested |  | (150) | ​ | $ | 57.16 |
RSUs forfeited |  | (38) | ​ | $ | 59.38 |
RSUs outstanding at end of period |  | 682 | ​ | $ | 57.97 |
Restricted Stock Units (RSUs) [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Summary of stock option activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Nine Months Ended September 30, 2020 | ​
​ |  | ​ |  | Weighted- | ​
​ | ​ | ​ | ​ | Average | ​
​ | ​ | Number of | ​ | Exercise Price | ​
​ | ​ | Options | ​ | per Share | ​
Options outstanding at beginning of period |  | 185 | ​ | $ | 21.56 |
Options exercised |  | (32) | ​ | $ | 13.39 |
Options forfeited |  | — | ​ | $ | — |
Options expired |  | (4) | ​ | $ | 15.58 |
Options outstanding at end of period |  | 149 | ​ | $ | 23.48 |

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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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