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STOCK-BASED COMPENSATION - Summary of stock options and stock options with market conditions (Details) | 9 Months Ended
--- | ---
Sep. 30, 2021 USD ($) $ / shares shares
Stock options, Grant Date Fair Value Valuation |
Share price (in dollars per share) | $ / shares | $ 139.83
Grant date fair value (in dollars per share) | $ / shares | $ 129.21
Option |
Stock options, Shares |
Outstanding at the beginning of the period (in shares) | shares | 924,710
Granted (in shares) | shares | 70,968
Exercised (in shares) | shares | (156,113)
Forfeited (in shares) | shares | (13,063)
Expired (in shares) | shares | (35)
Outstanding at the end of the period (in shares) | shares | 826,467
Options exercisable at the end of the period (in shares) | shares | 547,177
Stock options, Weighted Average Exercise Price |
Outstanding at the beginning of the period (in dollars per share) | $ / shares | $ 111.82
Granted (in dollars per share) | $ / shares | 241.84
Exercised (in dollars per share) | $ / shares | 7.17
Forfeited (in dollars per share) | $ / shares | 261.62
Expired (in dollars per share) | $ / shares | 371.25
Outstanding at the end of the period (in dollars per share) | $ / shares | 140.38
Options exercisable at the end of the period (in dollars per share) | $ / shares | $ 72.09
Stock options, Weighted Average Remaining Contractual Term |
Outstanding at the end of the period | 4 years 10 months 13 days
Options exercisable at the end of the period | 2 years 10 months 28 days
Stock options, Aggregate Intrinsic Value |
Outstanding at the end of the period | $ | $ 50,380,000
Options exercisable at the end of the period | $ | $ 50,380,000
Stock options, Grant Date Fair Value Valuation |
Expected dividend rate | 0.00%
Expected dividends | $ | $ 0
Option | Vesting period one |
Stock options, Grant Date Fair Value Valuation |
Vesting period | 1 year
Option | Vesting period two |
Stock options, Grant Date Fair Value Valuation |
Vesting period | 3 years
Option | Minimum |
Stock options, Grant Date Fair Value Valuation |
Expected term | 5 years
Risk-free interest rate | 0.59%
Expected volatility rate | 53.00%
Option | Maximum |
Stock options, Grant Date Fair Value Valuation |
Expected term | 6 years
Risk-free interest rate | 1.07%
Expected volatility rate | 59.00%
Market options |
Stock options, Shares |
Outstanding at the beginning of the period (in shares) | shares | 700,209
Granted (in shares) | shares | 0
Exercised (in shares) | shares | 0
Forfeited (in shares) | shares | 0
Expired (in shares) | shares | 0
Outstanding at the end of the period (in shares) | shares | 700,209
Options exercisable at the end of the period (in shares) | shares | 0
Stock options, Weighted Average Exercise Price |
Outstanding at the beginning of the period (in dollars per share) | $ / shares | $ 236.01
Granted (in dollars per share) | $ / shares | 0
Exercised (in dollars per share) | $ / shares | 0
Forfeited (in dollars per share) | $ / shares | 0
Expired (in dollars per share) | $ / shares | 0
Outstanding at the end of the period (in dollars per share) | $ / shares | 236.01
Options exercisable at the end of the period (in dollars per share) | $ / shares | $ 0
Stock options, Weighted Average Remaining Contractual Term |
Outstanding at the end of the period | 7 years
Options exercisable at the end of the period | 0 years
Stock options, Aggregate Intrinsic Value |
Outstanding at the end of the period | $ | $ 0
Options exercisable at the end of the period | $ | $ 0
Stock options, Grant Date Fair Value Valuation |
Maximum number of shared to be earned | shares | 1,169,349
Percentage of target number of shares | 167.00%
Performance awards earned (in shares) | shares | 481,669

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- Definition The estimated amount of dividends to be paid to holders of the underlying shares (expected dividends) over the option's term. Dividends are taken into account because payment of dividends to shareholders reduces the fair value of the underlying shares, and option holders generally do not receive dividends. + 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 (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + 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 (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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