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INCOME TAXES - Net deferred tax assets and liabilities (Details) - USD ($) | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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Deferred tax assets; |  |  |  |
Net operating loss carryforwards | $ 3,678,381 | $ 1,690,095 | $ 1,520,710 |
Other current assets | 776,016 | 1,312,997 | 41,298 |
Stock-based compensation | 565,018 | 216,918 | 38,050 |
Operating lease liabilities | 548,732 | 254,088 | 167,521 |
Financial liabilities | 173,587 | 163,011 | 82,808 |
Accounts receivable, net | 121,417 | 94,387 | 5,255 |
Accrued expenses and other current liabilities | 89,475 | 16,951 | 96,411 |
Other non-current liabilities | 71,445 | 14,933 | 11,681 |
Total deferred tax assets | 6,024,071 | 3,763,380 | 1,963,734 |
Deferred tax liabilities; |  |  |  |
Property, equipment and deposits, net | (1,428,847) | (731,113) | (379,515) |
Operating lease right of use assets | (687,993) | (254,088) | (167,521) |
Other | (26,798) | (42,298) | (3,648) |
Total deferred tax liabilities: | (2,143,638) | (1,027,499) | (550,684) |
Less valuation allowance | $ (3,880,433) | $ (2,735,881) | $ (1,413,050) | $ (1,162,612)

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