For a classified balance sheet, the cumulative difference as of the balance sheet date between the 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, by the lessor or lessee, respectively, within one year of the balance sheet date.

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Present value of lessee's discounted obligation for lease payments from operating lease, classified as current.

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Impact of Recently Issued Accounting Standards - Impact of Adopting ASU 2016-02 (Details) - USD ($)	Sep. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred rent			$ 1,065,387
Deferred rent, net of current portion			$ 8,518,207
Operating lease right-of-use assets	$ 14,002,860	$ 14,634,769
Operating lease liability	2,011,008	1,733,600
Operating lease liability, net of current portion	$ 20,953,308	22,484,763
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets		14,600,000
Previously Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred rent		1,065,387
Deferred rent, net of current portion		8,518,207
Impact of Adoption \| Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred rent		(1,065,387)
Deferred rent, net of current portion		(8,518,207)
Operating lease right-of-use assets		14,634,769
Operating lease liability		1,733,600
Operating lease liability, net of current portion		$ 22,484,763