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NOTES PAYABLE (Tables) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Debt Instrument [Line Items] |  |
Maturities of long-term debt | The following table summarizes the aggregate undiscounted amount of maturities of all borrowings as of March 31, 2021 (in thousands): ​
​ |  | Payment Schedule |
Remainder of 2021 | ​ | $ | 36,052 | ​
2022 | ​ | ​ | 821 | ​
2023 | ​ | ​ | 979 | ​
2024 | ​ | ​ | 1,167 | ​
2025 | ​ | ​ | 1,392 | ​
Thereafter | ​ | ​ | 2,614 | ​
Total | ​ | $ | 43,025 | ​
Notes payable |  |
Debt Instrument [Line Items] |  |
Components of debt |  | The Company’s outstanding notes payable consisted of the following as of December 31, 2020 (in thousands):
​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2020
Outstanding principal | ​ | $ | 38,866
Unamortized discount | ​ | ​ | (571)
Carrying value of debt | ​ | $ | 38,295
​
Maturities of long-term debt |  | The following table summarizes the aggregate undiscounted amount of maturities of all borrowings as of December 31, 2020 (in thousands):
​ | ​ | ​ | ​
​ | ​ | Payment
​ |  | Schedule
2021 | ​ | $ | 33,712
2022 | ​ |  | 821
2023 | ​ |  | 979
2024 | ​ |  | 1,167
2025 | ​ |  | 1,392
Thereafter | ​ |  | 795
Total | ​ | $ | 38,866

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- Definition Tabular disclosure of maturity and sinking fund requirement for long-term debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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