Number of shares authorized for issuance under share-based payment arrangement.

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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.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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

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

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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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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The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

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The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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- Definition

Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

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- Definition

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

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Equity Compensation - Stock Options Outstanding by Exercise Price (Details) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding - Weighted Average Exercise Price (in dollars per share)	$ 12.69	$ 16.07	$ 18.26	$ 18.78
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	750,159	1,081,804	1,441,202	1,885,262
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period	(331,645)	(359,398)	(444,060)
Canceled - Weighted Average Exercise Price (in dollars per share)	$ 23.71	$ 24.84	$ 20.49
Options exercisable at end of period (in shares)	750,159	1,081,804	910,267
2018 Plan
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of shares authorized	3,475,496
2013 Plan
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of shares authorized		3,540,534	3,851,945
$12.15 – $20.00 \| Minimum
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, upper limit (in dollars per shares)	$ 12.15	$ 12.15	$ 12.15
$12.15 – $20.00 \| Maximum
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, upper limit (in dollars per shares)	20.00
$30.01 – $33.36 \| Maximum
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, upper limit (in dollars per shares)	$ 17.47	$ 33.36	$ 33.36
Stock Options \| $12.15 – $20.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding - Number Outstanding at end of period (in shares)	750,159
Options Outstanding - Weighted Average Remaining Contractual Life	4 years
Options Outstanding - Weighted Average Exercise Price (in dollars per share)	$ 12.69
Options Exercisable - Number Exercisable at end of period (in shares)	750,159
Options Exercisable - Weighted Average Exercise Price (in dollars per share)	$ 12.69