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Stock Compensation (Tables) | 12 Months Ended
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Dec. 31, 2020
Stock Compensation |
Schedule of valuation assumptions used for valuation of fair value of stock compensation granted | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Employee Stock Options | ​ | Employee Stock Purchase Plan | ​
​ | ​ | For the year ended December 31, | ​ | For the year ended December 31, | ​
​ |  | 2020 |  | 2019 |  | 2018 |  | 2020 |  | 2019 |  | 2018 | ​
Average risk-free interest rates | ​ | 0.80 | % | 2.27 | % | 2.61 | % | 0.17 | % | 1.82 | % | 2.62 | %
Average expected life (in years) | ​ | 4.98 | ​ | 5.27 | ​ | 5.26 | ​ | 0.50 | ​ | 0.50 | ​ | 0.50 | ​
Volatility | ​ | 40 | % | 45 | % | 45 | % | 45 | % | 31 | % | 46 | %
Weighted-average fair value (in dollars) | ​ | 32.65 | ​ | 32.38 | ​ | 34.20 | ​ | 19.13 | ​ | 14.04 | ​ | 15.80 | ​

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock options plan and employee stock purchase plans, including, but not limited to: (a) expected term, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References No definition available. + Details
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- References No definition available. + Details
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