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Leases | 12 Months Ended
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Dec. 31, 2018
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. Rent expense and sublease income were as follows for the years ended December 31:
|  | 2018 |  | 2017 |  | 2016
Rent expense |  | $ | 1,136,610 |  | $ | 1,074,437 |  | $ | 1,150,614
Sublease income |  | $ | 662,358 |  | $ | 573,494 |  | $ | 646,235
Cumulative future minimum sublease income under noncancelable operating subleases totals approximately $0.3 million and will be paid through the leases ending in February 2019, March 2019, and October 2022. Future minimum lease payments under noncancelable operating leases (with initial or remaining lease terms in excess of one year) are as follows:
Year ending December 31: |  |
2019 |  | $ | 959,902
2020 |  | 980,720
2021 |  | 1,001,603
2022 |  | 871,969
2023 |  | 44,508
2024 and thereafter |  | —
Total future minimum lease payments |  | $ | 3,858,702

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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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=77888251 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -URI http://asc.fasb.org/topic&trid=2208923 + Details
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