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Leases | 12 Months Ended
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Dec. 31, 2020
Leases [Abstract] |
Leases | Leases The Company is obligated under long-term real estate leases for corporate office space that was extended during the third quarter of 2015. Prior to this extension, the lease would have expired in October 2016, the lease is now set to expire in October 2022. In addition, the research lab space at CET, under an agreement amended in July 2012, is leased through April 2023, with an option to extend the lease through April 2028. The Company also subleases a portion of the space under these leases. Rent expense is recognized over the expected term of the lease, including renewal option periods, if applicable, on a straight-line basis as a component of general and administrative expense. Rent expense and sublease income as follows for the years ended December 31:
|  | 2020 |  | 2019 |  | 2018
Rent expense |  | $ | 1,166,411 |  |  | $ | 1,246,143 |  |  | $ | 1,136,610 |
Sublease income |  | $ | 680,627 |  |  | $ | 688,020 |  |  | $ | 662,358 |
In March 2016, the FASB issued ASU 2016-02. ASU 2016-02’s core principle is to increase transparency and comparability among organizations by recognizing lease assets and liabilities on the balance sheet and disclosing key information. The primary effect of adopting ASU 2016-02 to the Company was to record right-of-use assets and obligations for the leases currently classified as operating leases. The Company’s significant operating leases include the lease of approximately 25,500 square feet of office space in Nashville, Tennessee for its corporate headquarters. This lease currently expires in October 2022. The operating leases also include the lease of approximately 14,200 square feet of wet laboratory and office space in Nashville, Tennessee by CET, our majority-owned subsidiary, where it operates the CET Life Sciences Center. This lease currently expires in April 2023. These operating leases resulted in initial ROU assets of $3.6 million and lease liabilities of $3.8 million as of January 1, 2019 for non-cancelable operating leases with original lease terms in excess of one year. Operating lease liabilities were recorded as the present value of remaining lease payments not yet paid for the lease term discounted using the incremental borrowing rate associated with each lease. Operating lease right-of-use assets represent operating lease liabilities adjusted for lease incentives and initial direct costs. As the Company’s leases do not contain implicit borrowing rates, the incremental borrowing rates were calculated based on information available at January 1, 2019. Incremental borrowing rates reflect the Company’s estimated interest rates for collateralized borrowings over similar lease terms. The weighted-average remaining lease term is 2.0 years and the weighted-average incremental borrowing rate used to discount the present value of the remaining lease payments is 7.42%. Lease Position At December 31, 2020 and 2019, the Company recorded the following on the Consolidated Balance Sheet:
Right-of-Use Assets |  | December 31, 2020 |  | December 31, 2019
Operating lease right-of-use assets |  | $ | 2,028,148 |  |  | $ | 2,960,569 |
Lease Liabilities |  | December 31, 2020 |  | December 31, 2019
Operating lease current liabilities |  | $ | 1,016,779 |  |  | $ | 920,431 |
Operating lease non-current liabilities |  | 1,059,693 |  |  | 2,076,472 |
Total |  | $ | 2,076,472 |  |  | $ | 2,996,903 |
Cumulative future minimum sublease income under non-cancelable operating subleases totals approximately $0.4 million and will be paid through the leases ending in October 2022 and April 2023. Future minimum lease payments under non-cancelable operating leases (with initial or remaining lease terms in excess of one year) are as follows:
Maturity of Leases Liabilities at December 31, 2020 |  | Operating Leases
2021 |  | $ | 1,144,889 |
2022 |  | 1,019,313 |
2023 |  | 92,478 |
After 2023 |  | — |
Total lease payments |  | 2,256,680 |
Less: Interest |  | (180,208) |
Present value of lease liabilities |  | $ | 2,076,472 |

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- Definition The entire disclosure for lessee entity's leasing arrangements including, but not limited to, all of the following: (a.) The basis on which contingent rental payments are determined, (b.) The existence and terms of renewal or purchase options and escalation clauses, (c.) Restrictions imposed by lease agreements, such as those concerning dividends, additional debt, and further leasing. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -URI http://asc.fasb.org/topic&trid=2208923 + Details
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