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STOCK-BASED COMPENSATION PLANS - Summary of stock option activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Summary of stock option activity under the option Plan
Number of Shares, Granted	100		100
Employee Stock Option [Member]
Summary of stock option activity under the option Plan
Balance Beginning		1,885
Number of Shares, Granted		415
Number of Shares, Expired		(7)
Number of Shares, Forfeited		(77)
Number of Shares, Exercised		(173)
Balance Ending		2,043		1,885
Number of Shares, Exercisable at December 31, 2018		1,216
Weighted Average Exercise Price, Outstanding Beginning		$ 0.80
Weighted Average Exercise Price, Granted		4.53
Weighted Average Exercise Price, Expired		1.00
Weighted Average Exercise Price, Exercised		0.79
Weighted Average Exercise Price, Forfeited		2.51
Weighted Average Exercise Price, Outstanding Ending		1.49		$ 0.80
Weighted Average Exercise Price, Exercisable		$ 0.40
Weighted Average Remaining Contractual Life, Outstanding		6 years 6 months		6 years 3 months 18 days
Weighted Average Remaining Contractual Life Exercisable		4 years 9 months 18 days
Aggregate Intrinsic Value, Outstanding		$ 15,326		$ 4,085
Aggregate Intrinsic Value, Exercisable		$ 10,449

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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.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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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 option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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

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Number of share options (or share units) exercised during the current period.

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