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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Unrecognized cost of unvested options awarded to employees as compensation.

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The cash outflow to reacquire common stock during the period.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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

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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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Number of increase (decrease) of non-vested options.

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Number of new stock issued during the period.

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STOCKHOLDERS' EQUITY - Narrative (Details)	1 Months Ended				12 Months Ended
STOCKHOLDERS' EQUITY - Narrative (Details)	Jan. 31, 2020 shares	May 31, 2019 shares	Jun. 30, 2018 USD ($) $ / shares shares	Apr. 30, 2018 USD ($)	Dec. 31, 2019 USD ($) plan $ / shares shares	Dec. 31, 2018 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate value of common stock and other securities \| $				$ 175,000,000	$ 133,438,000
Value of unsold securities on current effective registration statements \| $				$ 60,000,000
Stock issued (in Shares)			2,375,000
Public offering price (USD per Share) \| $ / shares			$ 17.50
Proceeds from issuance of common stock \| $			$ 38,900,000
Shares repurchase authorized					450,000
Shares repurchased					384,000
Payments for repurchase of common stock \| $					$ 5,000,000
Active equity plans \| plan					1
Shares available for future grant (in Shares)					387,000
Options granted (in Shares)					721,000
Compensation expense \| $					$ 1,990,000	$ 1,565,000
Exercised in period, intrinsic value \| $					356,000	276,000
Unrecognized compensation costs \| $					$ 2,180,000
Period of recognition of unrecognized compensation costs					2 years 2 months
The 2018 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future grant (in Shares)					750,000
Options granted (in Shares)					1,756,000
The 2018 Plan \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period					3 years
Award expiration period					5 years
The 2018 Plan \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period					4 years
Award expiration period					10 years
2018 Plan Amendment
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of increase in options (in Shares)		600,000
Offer Exchange Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding (USD per Share) \| $ / shares					$ 8.50
Number of shares underlying an eligible option in exchange for one new RSU (in Shares)					2.5
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted in exchange (in Shares)					29,000
Unrecognized compensation costs \| $					$ 540,000
Period of recognition of unrecognized compensation costs					1 year 9 months
Vested in period, fair value \| $					$ 430,000	$ 22,000
Subsequent Event \| Offer Exchange Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options purchased (in Shares)	467,500
Subsequent Event \| Restricted Stock Units (RSUs) \| Offer Exchange Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted in exchange (in Shares)	187,000