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LEASES (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
LEASES |  |  |
Initial lease term | 2 years 3 months 18 days |  | 5 years
Lease cost |  |  |
Operating lease costs | $ 346 | $ 1,869 |
Short-term lease costs | 2,231 | 16,372 |
Variable lease costs | 307 | 798 |
Total lease costs | 2,884 | 19,039 |
Other information |  |  |
Operating cash flows from operating leases | 439 | $ 2,093 |
Right-of-use assets obtained in exchange for new operating lease liabilities | $ 841 |  |
Weighted-average remaining lease term - operating leases | 2 years 2 months 12 days | 8 months 12 days |
Weighted-average discount rate - operating leases | 4.29% | 3.70% |

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- Definition Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=121568110&loc=SL77918982-209971 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980 + Details
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