STOCKHOLDERS' EQUITY - Stock option activity (Details) - USD ($)	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Condensed Consolidated Statements of Changes in Stockholders' (Deficit) Equity
Equity awards outstanding, beginning of year	2,526,166	2,605,730	1,916,900
Number of shares, Granted.		75,000	815,000
Number of shares, Exercised/Vested	(52,694)	(35,814)
Number of shares, Expired/Forfeited	(5,935)	(118,750)	(126,170)
Equity awards outstanding, end of period	2,467,537	2,526,166	2,605,730
Number of shares, Exercisable	1,368,106
Weighted - average exercise price, Outstanding Beginning Balance	$ 6.99	$ 6.73
Weighted - average exercise price, Granted		8.21	$ 6.50
Weighted - average exercise price, Exercised	4.10	4.10
Weighted - average exercise price, Forfeited	4.10	10.16	6.10
Weighted - average exercise price, Outstanding Ending Balance	7.06	$ 6.99	$ 6.73
Weighted - average exercise price, Exercisable	$ 6.57
Weighted - average contractual term	6 years 11 months 26 days	8 years 1 month 6 days	8 years 11 months 1 day
Weighted - average Contractual Term, Exercisable	7 years 18 days
Aggregate intrinsic value, Outstanding	$ 29,503,551	$ 115,472,832	$ 11,706,110
Aggregate Intrinsic Value, Exercisable	$ 17,023,532

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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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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Net 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 that were terminated.

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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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