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LONG-TERM DEBT - Equipment financing and other (Details) $ in Millions | Jun. 05, 2020 USD ($) | Nov. 06, 2019 USD ($) payment | May 17, 2019 USD ($) | Dec. 31, 2020 USD ($)
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May 2019 Equipment Financing |  |  |  |
Long-Term Debt |  |  |  |
Principal amount |  |  | $ 10.0 |
Term |  |  | 36 months |
Effective interest rate (as a percent) |  |  | 6.25% |
November 2019 Equipment Financing |  |  |  |
Long-Term Debt |  |  |  |
Principal amount |  | $ 53.1 |  |
Term |  | 4 years |  |
Effective interest rate (as a percent) |  | 4.75% |  |
Number of monthly payments | payment |  | 47 |  |
Periodic Payment |  | $ 1.0 |  |
Balloon payment on maturity |  | $ 11.6 |  |
June 2020 equipment financing |  |  |  |
Long-Term Debt |  |  |  |
Principal amount | $ 14.7 |  |  |
Term | 48 months |  |  |
Effective interest rate (as a percent) | 6.10% |  |  |
Letters of credit - Other |  |  |  |
Long-Term Debt |  |  |  |
Credit facility amount |  |  |  | $ 5.0

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