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Leases (Tables) | 6 Months Ended
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Jun. 30, 2019
Lessee Disclosure [Abstract] |
Summary of lease cost for operating leases | Lease cost for operating leases for the three and six months ended June 30, 2019 was as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Six Months Ended
​ |  | June 30, 2019 |  | June 30, 2019
Operating lease cost | ​ | $ | 9,657 | ​ | $ | 19,190
​ Supplemental cash flow information and non-cash activity related to the Company’s operating leases are as follows: ​
​ | ​ | ​ | ​
​ |  | Six months ended
​ | ​ | June 30, 2019
Operating cash flow information: | ​ | ​ | ​
Cash paid for amounts included in the measurement of lease liabilities | ​ | $ | 18,873
Non-cash activity: | ​ | ​ | ​
Right-of-use assets obtained in exchange for lease liabilities | ​ | $ | 4,554
​ Weighted-average remaining lease term and discount rate for the Company’s operating leases are as follows: ​
​ | ​ | ​ | ​
​ | ​ | Six months ended
​ |  | June 30, 2019
Weighted average remaining lease term | ​ | 9.0 | years
Weighted average discount rate | ​ | 3.98 | %
Summary of future minimum lease payments | As of June 30, 2019, future minimum lease payments, as calculated under the new lease guidance and reconciled to the operating lease liability, are as follows: ​
​ | ​ | ​ | ​
Last 6 months of 2019 |  | $ | 19,052
2020 | ​ |  | 36,032
2021 | ​ |  | 32,979
2022 | ​ |  | 31,617
2023 | ​ |  | 28,287
Thereafter | ​ |  | 93,995
Minimum lease payments | ​ |  | 241,962
Less: imputed interest | ​ |  | (40,878)
Present value of minimum lease payments | ​ | ​ | 201,084
Less: current portion of operating lease liabilities | ​ | ​ | (30,255)
Long-term portion of operating lease liabilities | ​ | $ | 170,829
Summary of future minimum lease payments under non-cancelable operating leases | As of December 31, 2018, minimum lease payments under non-cancelable operating leases by period were expected to be as follows: ​
​ | ​ | ​ | ​
2019 |  | $ | 37,902
2020 | ​ |  | 35,204
2021 | ​ |  | 32,259
2022 | ​ |  | 30,974
2023 | ​ |  | 27,882
Thereafter | ​ |  | 94,205
​ | ​ | $ | 258,426
Summary of rent expense for both short-term agreements and non-cancelable operating lease agreements | A summary of rent expense for both short-term agreements and non-cancelable operating lease agreements for the years ended December 31, 2018 and 2017 was as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2018 | ​ | 2017
Rent expense |  | $ | 42,646 |  | $ | 43,383
​

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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=77888426&loc=SL77918686-209980 + Details
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- Definition Tabular disclosure of undiscounted cash flows of lessee's operating lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to operating lease liability recognized in statement of financial position. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980 + Details
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- Definition Tabular disclosure of future minimum payments required in the aggregate and for each of the five succeeding fiscal years for operating leases having initial or remaining noncancelable lease terms in excess of one year and the total minimum rentals to be received in the future under noncancelable subleases as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 + Details
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- Definition Tabular disclosure of rental expense from operating leases for each period for which an income statement is presented with separate amounts for minimum rentals, contingent rentals, and sublease rentals. Rental payments under leases with terms of a month or less that were not renewed need not be included. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717 + Details
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