PRINCIPAL BUSINESS ACTIVITY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Cash and Cash Equivalents (Details) - USD ($) |
Dec. 31, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
|---|---|---|---|---|
| PRINCIPAL BUSINESS ACTIVITY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES | ||||
| Cash and cash equivalents | $ 52,137,707 | $ 71,421,601 | ||
| Restricted cash | 1,687,459 | |||
| Total cash, cash equivalents and restricted cash | $ 53,825,166 | $ 71,421,601 | $ 12,232,418 | $ 22,368,837 |