EQUITY-BASED COMPENSATION - Summary of stock option activity (Details) - USD ($)	3 Months Ended	12 Months Ended
Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Shares
Outstanding, Beginning Balance (shares)	1,563,972	166,233	166,233
Granted (shares)	40,000	182,000
Exercised (shares)	0
Forfeited (shares)	0	(10,000)
Expired (shares)	0	0
Outstanding, Ending Balance (shares)	1,603,972	338,233	1,563,972	166,233
Exercisable (shares)	143,747	84,711
Weighted-Average Exercise Price
Weighted-average exercise price, Beginning Balance (in usd per share)	$ 2.44	$ 34.42	$ 34.42
Granted, weighted-average exercise price (in usd per share)	1.49	0.61
Exercised, weighted-average exercise price (in usd per share)
Forfeited, weighted-average exercise price (in usd per share)		0
Expired, weighted-average exercise price (in usd per share)
Weighted-average exercise price, Ending Balance (in usd per share)	2.75	17.01	$ 2.44	$ 34.42
Exercisable, weighted-average exercise price (in usd per share)	$ 18.96	$ 59.85
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Outstanding, weighted-average remaining contractual term	9 years 2 months 26 days	8 years 2 months 4 days	4 years 10 months 13 days	6 years 6 months 10 days
Exercisable, weighted-average remaining contractual term	7 years	3 years 2 months 23 days
Outstanding, aggregate intrinsic value	$ 784,801		$ 175,770	$ 0
Exercisable, aggregate intrinsic value	$ 57,900	$ 0

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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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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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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 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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