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Employee Stock Plans (Tables) | 3 Months Ended
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Mar. 31, 2021
Stock Based Compensation |
Summary of RSU activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Weighted
​ | ​ | ​ | ​ | Weighted | ​ | Average
​ | ​ | ​ | ​ | Average | ​ | Remaining
​ | ​ | ​ | ​ | Grant Date | ​ | Contractual
​ | ​ | Shares | ​ | Fair value | ​ | Term
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unvested at December 31, 2020 | ​ | 36,022 | ​ | $ | 42.73 | ​ | 1.40 | years
Granted | ​ | 132,316 | ​ | $ | 44.49 | ​ | 1.42 | years
Vested | ​ | (86,375) | ​ | $ | 39.69 | ​ | ​ | ​
Cancelled and forfeited | ​ | (835) | ​ | $ | 44.49 | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unvested at March 31, 2021 | ​ | 81,128 | ​ | $ | 48.81 | ​ | 1.62 | years
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Expected to vest in the future at March 31, 2021 | ​ | 80,317 | ​ | $ | 48.81 | ​ | 1.62 | years

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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