The cumulative difference between the rental payments required by a lease agreement and the rental income or expense recognized on a straight-line basis, or other systematic and rational basis more representative of the time pattern in which use or benefit is granted or derived from the leased property, expected to be recognized in income or expense over the term of the leased property by the lessor or lessee, respectively.

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Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

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Operating Leases (Details) - USD ($)	12 Months Ended
Operating Leases (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	May 31, 2016
Operating leases, rent expense	$ 890,170	$ 784,739	$ 595,497
Security deposit paid	52,320	52,320
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2018	965,368
2019	989,502
2020	1,014,239
2021	1,039,595
2022	1,065,585
After 2022	906,669
Total	5,980,958
Rockville
Deferred Rent Credit	$ 785,031	$ 822,130
Security deposit paid				$ 52,320