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LEASES (Tables) | 6 Months Ended
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Jun. 30, 2021
Leases |
Summary of total lease cost | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Three Months Ended | ​ | For the Six Months Ended
​ | ​ | June 30, | ​ | June 30,
​ |  | 2021 | ​ | 2020 |  | 2021 | ​ | 2020
Operating lease cost | ​ | $ | 87,363 | ​ | $ | 83,461 | ​ | $ | 174,582 | ​ | $ | 166,656
Short-term operating lease cost | ​ |  | 1,661 | ​ |  | 941 | ​ |  | 3,594 | ​ |  | 2,725
Variable operating lease cost | ​ |  | 22,645 | ​ |  | 20,776 | ​ |  | 44,589 | ​ |  | 41,109
Sublease income | ​ |  | (1,185) | ​ |  | (1,187) | ​ |  | (2,383) | ​ |  | (2,362)
Total lease cost | ​ | $ | 110,484 | ​ | $ | 103,991 | ​ | $ | 220,382 | ​ | $ | 208,128
Other lease related information | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | For the Six Months Ended
​ | ​ | June 30,
​ | ​ | 2021 | ​ | 2020
Cash paid for amounts included in the measurement of operating lease liabilities: |  | ​ |  | ​ | ​ | ​
​ | Operating cash flows from operating leases | ​ | $ | 169,864 | ​ | $ | 165,665
Right-of-use assets obtained in exchange for new operating lease liabilities | ​ | ​ | 165,193 | ​ | ​ | 125,160

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- Definition Tabular disclosure of other lease information for lessee's operating leases. + References No definition available. + Details
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- Definition Tabular disclosure of lessee's lease cost. Includes, but is not limited to, interest expense for finance lease, amortization of right-of-use asset for finance lease, operating lease cost, short-term lease cost, variable lease cost and sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918686-209980 + Details
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- References No definition available. + Details
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