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STOCK-BASED COMPENSATION PLANS - Summary of stock option activity (Details) $ / shares in Units, shares in Thousands, $ in Thousands		9 Months Ended
	Dec. 31, 2019 USD ($) $ / shares shares	Sep. 30, 2020 USD ($) $ / shares shares	Sep. 30, 2019 $ / shares
Summary of stock option activity under the option Plan
Outstanding and Exercisable at September 30, 2020		1,015
Number of Shares, Exercisable		543
Weighted Average Exercise Price, Granted | $ / shares		$ 10.15	$ 5.65
Employee Stock Option [Member]
Summary of stock option activity under the option Plan
Outstanding at December 31, 2019		1,855
Number of Shares, Granted		14
Number of Shares, Expired		0
Number of Shares, Forfeited		(234)
Number of Warrants, Exercised		(620)
Outstanding and Exercisable at September 30, 2020	1,855	1,015
Number of Shares, Exercisable		543
Weighted Average Exercise Price, Outstanding at December 31, 2019 | $ / shares		$ 2.48
Weighted Average Exercise Price, Granted | $ / shares		10.15
Weighted Average Exercise Price, Expired | $ / shares		0
Weighted Average Exercise Price, Forfeited | $ / shares		4.71
Weighted Average Exercise Price, Exercised | $ / shares		0.90
Weighted Average Exercise Price, Outstanding at June 30, 2020 | $ / shares	$ 2.48	3.04
Weighted Average Exercise Price, Exercisable at June 30, 2020 | $ / shares		$ 1.47
Weighted Average Remaining Contractual Life, Outstanding	6 years 5 months 1 day	6 years 8 months 26 days
Weighted Average Remaining Contractual Life, Exercisable (Years)		5 years 5 months 19 days
Aggregate Intrinsic Value, Outstanding | $	$ 10,032	$ 14,622
Aggregate Intrinsic Value, Exercisable | $		$ 8,677

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

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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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