Share-Based Compensation Arrangement By Share-Based Payment Award, Non-Option Equity Instruments, Granted To Date

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Share-Based Compensation Arrangement By Share-based Payment Award, Options, Grants In Period, Fair Value

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Share-based Compensation Arrangement By Share-based Payment Award, Options, Intrinsic Value, Closing Stock Price

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Stock Issued During Period, Shares, Stock Swaps

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Stock Issued During Period, Shares, Stock Swaps Equity Instruments Received

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

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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 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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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 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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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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- Definition

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

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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- Definition

Number of fully vested and expected to vest exercisable options that may be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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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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- Definition

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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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.

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Weighted average remaining contractual term for fully vested and expected to vest exercisable or convertible options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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STOCK OPTIONS - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended	12 Months Ended
	Jan. 29, 2020	Oct. 31, 2015	Dec. 31, 2020	Dec. 31, 2019	Aug. 31, 2019	Aug. 31, 2017	Jul. 31, 2015	Jul. 31, 2012	Oct. 30, 2007	Dec. 31, 2001
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option expiration period			10 years
Option vesting period	3 years
Granted (in shares)	700,000		1,376,900	1,379,500
Share-based compensation expense			$ 4,210	$ 3,581
Closing stock price for computation of intrinsic value (in dollars per share)			$ 7.20
Stock options outstanding and expected to vest (in shares)			4,530,049
Aggregate intrinsic value of all stock options outstanding and expected to vest			$ 10,250
Stock options outstanding and expected to vest, weighted average exercise price (in dollars per share)			$ 5.26
Stock options outstanding and exercisable, weighted average remaining contractual term			7 years
Stock options outstanding and exercisable (in shares)			2,894,474
Aggregate intrinsic value of currently exercisable stock options			$ 9,800
Weighted average exercise price (in dollars per share)			$ 3.89
Weighted average remaining contractual term			6 years
Intrinsic value of options exercised			$ 200	1,420
Intrinsic value of options granted			$ 6,580	$ 6,300
Weighted average grant date fair value of options granted (in dollars per share)			$ 4.78	$ 4.57
Fair value of option shares vested			$ 2,510	$ 2,130
Shares received in stock swaps (in shares)			39,448	125,948
Shares issued in stock swaps (in shares)			47,088	222,601
Unrecognized stock-based compensation cost			$ 5,910
Unrecognized stock-based compensation cost, recognition period			1 year
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option vesting period			1 year
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option vesting period			7 years
Restricted
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option vesting period		5 years
Grants to date (in shares)		225,922
2001 Executive and Employee Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized under common stock option plans (in shares)										1,200,000
2003 Executive and Employee Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized under common stock option plans (in shares)									1,700,000
2012 Share Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized under common stock option plans (in shares)								750,000
Remaining shares for issuance (in shares)			60,000
2015 Executive and Employee Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized under common stock option plans (in shares)							2,000,000
Remaining shares for issuance (in shares)			230,000
2017 Executive and Employee Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized under common stock option plans (in shares)						3,000,000
Remaining shares for issuance (in shares)			70,000
2019 Share Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized under common stock option plans (in shares)					2,000,000
Remaining shares for issuance (in shares)			2,000,000