Number of independent directors.

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Period within which business combination is to be completed from IPO, , in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The total fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Net number of non-option equity instruments granted to participants adjusted for the effect of stock dividends.

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Number of equity instruments other than options outstanding held by each awardee.

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Share-Based Compensation Arrangement By Share-based Payment Award, Purchase Period

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Share-based Compensation Arrangement by Share-based Payment Award, Options, Strike Exercise Price Multiplier, Percent

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Number of shares based awards subject to forfeiture when certain conditions are not met.

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Percentage of forfeiture rate of share based awards when certain conditions are not met.

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Minimum per share amount of stock trading to be met as condition for vesting of share based awards.

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The number of days within which period of trading the minimum per share amount of stock trading to be met as condition for vesting of share based awards.

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Period within which the number of days of trading the minimum per share amount of stock trading is to be met as a condition for vesting of share based awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of performance conditions that are to be met to vest share based awards.

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Aggregate number of common shares reserved for future issuance.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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Amount of cost to be recognized for option under share-based payment arrangement.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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Discount rate from fair value on purchase date that participants pay for shares.

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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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Number of shares under non-option equity instrument agreements that were cancelled as a result of occurrence of a terminating event.

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Net number of non-option equity instruments granted to participants.

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Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

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

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Gross number of share options (or share units) granted during the period.

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Number of shares issued under share-based payment arrangement.

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Purchase price of common stock expressed as a percentage of its fair value.

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Stock Compensation - Narrative (Details)			1 Months Ended		12 Months Ended
Stock Compensation - Narrative (Details)	Jul. 31, 2020 shares	Jan. 31, 2014 USD ($) director day condition $ / shares shares	Jun. 30, 2019 shares	Feb. 28, 2014 shares	Dec. 31, 2021 USD ($) shares	Dec. 31, 2020 USD ($) shares	Dec. 31, 2019 USD ($) shares	Mar. 13, 2014 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense \| $					$ 3,213,000	$ 3,598,000	$ 2,714,000
Granted (in shares)					1,098,000	0
Number of independent directors \| director		3
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period					3 years
Strike exercise price multiplier, percent					200.00%
Unrecognized compensation costs for options \| $					$ 1,100,000
Period for compensation recognition					2 years 4 months 24 days
Stock appreciation rights (SAR)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period							3 years
Strike exercise price multiplier, percent					200.00%
Granted (in shares)					0	0
Unrecognized compensation cost for shares \| $					$ 0
Outstanding shares (in shares)					48,000	48,000	84,000
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period					3 years	3 years
Period for compensation recognition					2 years
Unrecognized compensation cost for shares \| $					$ 4,500,000
Phantom stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period					3 years
Period for compensation recognition					1 year 4 months 24 days
Unrecognized compensation cost for shares \| $					$ 300,000
Director shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)		20,125
Number shares transferred, as adjusted for the effect of dividends (in shares)				60,375
Number of shares held by each director (in shares)								18,375
Outstanding shares (in shares)								55,125
Number to performance conditions \| condition		2
Period within which business combination is to be completed from IPO		21 months
Percentage of forfeitable shares under certain conditions		25.00%
Forfeitable shares under certain conditions (in shares)		13,781
Minimum stock trading price (in dollars per share) \| $ / shares		$ 13
Number of days of trading period of the minimum trading price \| day		20,000
Period of trading period of the minimum stock trading price		30 days
Non-option equity instruments, forfeitures	13,781
Aggregate fair value \| $		$ 400,000
Restricted stock \| Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period					1 year	1 year
Period for compensation recognition					7 months 6 days
Unrecognized compensation cost for shares \| $					$ 300,000
2015 Incentive Compensation Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized to grant (in shares)					13,650,000
Available for grant (in shares)					6,865,213
Stock-based compensation expense \| $					$ 3,200,000	$ 3,600,000	$ 2,700,000
2019 Employee Stock Purchase Plan \| Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for future issuance (in shares)			1,250,000,000
Discount from market price, purchase date			15.00%
Purchase period			6 months
ESPP purchase price of common stock, percent of closing price			85.00%
Issued under the ESPP (in shares)					468,384