SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Summary of Stock Option, Warrants, and RSUs Activity (Details)	3 Months Ended
Mar. 31, 2022 shares
Stock Options
Number of Options
Balance at beginning of the period (in shares)	191,340
Forfeited/Expired	(11,366)
Balance at end of the period (in shares)	179,974
Vested (in shares)	86,708
Unvested (in shares)	93,266
Number of warrants
Exercised/Settled	(93,266)
Warrants
Number of warrants
Balance at beginning of the period (In shares)	30,173
Forfeited/Expired	(1,600)
Balance at end of the period (In shares)	28,573
Vested (in shares)	28,573
Unvested (in shares)	28,573
Restricted Stock Units
Number of Options
Unvested (in shares)	34,169
Number of warrants
Balance at end of the period (In shares)	727,436
Balance at beginning of the period (In shares)	1,033,240
Granted	72,742
Exercised/Settled	(34,169)
Forfeited/Expired	0
Balance at end of the period (In shares)	1,071,813
Vested (in shares)	344,377
Unvested (in shares)	727,436

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Number of non-option equity instruments exercised by participants.

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Number of shares under non-option equity instrument agreements that were either cancelled or expired.

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Net number of non-option equity instruments granted to participants.

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Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Number of options outstanding, including both vested and non-vested options.

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