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Leases - Lease assets and liabilities (Details) - USD ($) | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Current |  |
Prepaid expenses and other current assets | $ 57,249 |
Noncurrent |  |
Operating lease right-of-use assets | 4,393,737 | $ 0
Total lease right-of-use assets | 4,450,986 |
Current |  |
Current maturities of operating leases | 647,709 | 0
Noncurrent |  |
Noncurrent operating leases | 3,809,573 | $ 0
Total lease liabilities | $ 4,457,282 |
Operating leases | 18 years |
Operating leases | 4.61% |

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- Definition Amount of lessee's right to use underlying asset net under operating lease. + References No definition available. + Details
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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- Definition Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + 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=77888399&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 (g)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 + Details
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