The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The estimated measure of the maximum 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

No definition available.

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The estimated measure of the minimum 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

No definition available.

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The maximum risk-free interest rate assumption that is used in valuing an option on its own shares.

+ References

No definition available.

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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.

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No definition available.

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- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

+ References

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- Definition

Number of options outstanding, including both vested and non-vested options.

+ 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
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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 (c)(1)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

+ References

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- Definition

Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ 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
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.D.2)
-URI http://asc.fasb.org/extlink&oid=122041274&loc=d3e301413-122809

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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Share-based Compensation and Equity - Summary of Stock Option Plans, by Exercise Price Range (Details) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Prices	$ 9.89	$ 17.85	$ 18.18	$ 18.79
Options Outstanding, Number of Shares (in shares)	2,163,000	3,428,000	5,388,000	9,020,000
Options Exercisable, Number of Shares (in shares)	2,163,000	3,292,000	4,846,000
Stock options, net of estimated forfeitures
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected dividend yield	0.00%	0.00%	0.00%
$6.38 - $7.96
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Number of Shares (in shares)	414,000
Options Outstanding, Weighted Average Remaining Contractual Terms (Years)	5 years 11 months 23 days
Options Exercisable, Number of Shares (in shares)	414,000
Options Exercisable, Weighted Average Remaining Contractual Terms (Years)	5 years 11 months 23 days
Risk-Free Interest Rate, Minimum	2.68%
Risk-Free Interest Rate, Maximum	3.05%
Expected Volatility, Minimum	38.29%
Expected Volatility, Maximum	57.25%
$6.38 - $7.96 \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Prices	$ 6.38
Expected Terms in Years	5 years 6 months 14 days
$6.38 - $7.96 \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Prices	$ 7.96
Expected Terms in Years	5 years 10 months 28 days
$8.79 - $10.30
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Number of Shares (in shares)	1,655,000
Options Outstanding, Weighted Average Remaining Contractual Terms (Years)	1 year 6 months 10 days
Options Exercisable, Number of Shares (in shares)	1,655,000
Options Exercisable, Weighted Average Remaining Contractual Terms (Years)	1 year 6 months 10 days
Risk-Free Interest Rate, Minimum	1.45%
Risk-Free Interest Rate, Maximum	2.34%
Expected Volatility, Minimum	35.20%
Expected Volatility, Maximum	58.84%
$8.79 - $10.30 \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Prices		$ 8.79
Expected Terms in Years	3 years 2 months 12 days
$8.79 - $10.30 \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Prices		10.30
Expected Terms in Years	7 years 1 month 13 days
$15.27 - $24.33
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Number of Shares (in shares)	94,000
Options Outstanding, Weighted Average Remaining Contractual Terms (Years)	5 months 8 days
Options Exercisable, Number of Shares (in shares)	94,000
Options Exercisable, Weighted Average Remaining Contractual Terms (Years)	5 months 8 days
Risk-Free Interest Rate, Minimum	0.76%
Risk-Free Interest Rate, Maximum	2.35%
Expected Volatility, Minimum	39.38%
Expected Volatility, Maximum	53.80%
$15.27 - $24.33 \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Prices		$ 15.27
Expected Terms in Years		4 years 1 month 28 days
$15.27 - $24.33 \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Prices	$ 24.33
Expected Terms in Years	6 years 6 months 7 days
$13.97 - $15.55
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Number of Shares (in shares)		748,000	944,000
Options Outstanding, Weighted Average Remaining Contractual Terms (Years)		6 years 10 months 2 days	7 years 10 months 20 days
Options Exercisable, Number of Shares (in shares)		625,000	524,000
Options Exercisable, Weighted Average Remaining Contractual Terms (Years)		6 years 6 months 29 days	7 years 21 days
Risk-Free Interest Rate, Minimum		1.99%	1.81%
Risk-Free Interest Rate, Maximum		3.05%	3.05%
Expected Volatility, Minimum		38.29%	38.29%
Expected Volatility, Maximum		64.18%	64.18%
$13.97 - $15.55 \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Prices		$ 13.97	$ 13.97
Expected Terms in Years		3 years 3 months	3 years 3 months
$13.97 - $15.55 \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Prices		$ 15.55	$ 15.55
Expected Terms in Years		5 years 10 months 28 days	5 years 10 months 28 days
$16.38 - $17.89
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Number of Shares (in shares)		2,247,000
Options Outstanding, Weighted Average Remaining Contractual Terms (Years)		2 years 8 months 19 days
Options Exercisable, Number of Shares (in shares)		2,235,000
Options Exercisable, Weighted Average Remaining Contractual Terms (Years)		2 years 8 months 4 days
Risk-Free Interest Rate, Minimum		1.38%
Risk-Free Interest Rate, Maximum		2.34%
Expected Volatility, Minimum		35.20%
Expected Volatility, Maximum		58.84%
$16.38 - $17.89 \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Prices		$ 16.38
Expected Terms in Years		3 years 2 months 12 days
$16.38 - $17.89 \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Prices		$ 17.89
Expected Terms in Years		7 years 1 month 13 days
$21.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Number of Shares (in shares)		146,000
Options Outstanding, Weighted Average Remaining Contractual Terms (Years)		8 months 12 days
Options Exercisable, Number of Shares (in shares)		146,000
Options Exercisable, Weighted Average Remaining Contractual Terms (Years)		8 months 12 days
Risk-Free Interest Rate, Minimum		1.81%
Expected Volatility, Minimum		57.79%
$21.00 \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Prices		$ 21.00
Expected Terms in Years		4 years
$22.88 - $31.92
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Number of Shares (in shares)		287,000
Options Outstanding, Weighted Average Remaining Contractual Terms (Years)		9 months 3 days
Options Exercisable, Number of Shares (in shares)		287,000
Options Exercisable, Weighted Average Remaining Contractual Terms (Years)		9 months 3 days
Risk-Free Interest Rate, Minimum		0.73%
Risk-Free Interest Rate, Maximum		2.86%
Expected Volatility, Minimum		39.03%
Expected Volatility, Maximum		53.80%
$22.88 - $31.92 \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Prices		$ 22.88
Expected Terms in Years		4 years
$22.88 - $31.92 \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Prices		$ 31.92
Expected Terms in Years		6 years 6 months 7 days
$17.00 - $19.56
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Number of Shares (in shares)			3,597,000
Options Outstanding, Weighted Average Remaining Contractual Terms (Years)			3 years 1 month 13 days
Options Exercisable, Number of Shares (in shares)			3,475,000
Options Exercisable, Weighted Average Remaining Contractual Terms (Years)			2 years 11 months 12 days
Risk-Free Interest Rate, Minimum			1.38%
Risk-Free Interest Rate, Maximum			2.94%
Expected Volatility, Minimum			35.20%
Expected Volatility, Maximum			58.84%
$17.00 - $19.56 \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Prices			$ 17.00
Expected Terms in Years			2 years 7 months 6 days
$17.00 - $19.56 \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Prices			$ 19.56
Expected Terms in Years			10 years
$21.00 - $21.52
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Number of Shares (in shares)			330,000
Options Outstanding, Weighted Average Remaining Contractual Terms (Years)			1 year 1 month 2 days
Options Exercisable, Number of Shares (in shares)			330,000
Options Exercisable, Weighted Average Remaining Contractual Terms (Years)			1 year 1 month 2 days
Risk-Free Interest Rate, Minimum			0.68%
Risk-Free Interest Rate, Maximum			2.61%
Expected Volatility, Minimum			38.16%
Expected Volatility, Maximum			57.79%
$21.00 - $21.52 \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Prices			$ 21.00
Expected Terms in Years			3 years 9 months 14 days
$21.00 - $21.52 \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Prices			$ 21.52
Expected Terms in Years			6 years 6 months 18 days
$22.32 - $31.92
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Number of Shares (in shares)			517,000
Options Outstanding, Weighted Average Remaining Contractual Terms (Years)			1 year 5 months 8 days
Options Exercisable, Number of Shares (in shares)			517,000
Options Exercisable, Weighted Average Remaining Contractual Terms (Years)			1 year 5 months 8 days
Risk-Free Interest Rate, Minimum			0.60%
Risk-Free Interest Rate, Maximum			3.03%
Expected Volatility, Minimum			36.93%
Expected Volatility, Maximum			53.80%
$22.32 - $31.92 \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Prices			$ 22.32
Expected Terms in Years			3 years 2 months 4 days
$22.32 - $31.92 \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Prices			$ 31.92
Expected Terms in Years			6 years 6 months 7 days