Summary of Significant Accounting Policies - Cumulative Effect of Change in Accounting Principle (Details) - USD ($)		12 Months Ended
	Jan. 01, 2018	Dec. 31, 2018	Dec. 31, 2017
Modified retrospective opening balance adjustment		$ 8,929,204
Deferred Revenue		9,366,490	$ 18,360,690
Contract with Customer, Asset, Net		$ 1,200,000	$ 0
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]
Modified retrospective opening balance adjustment	$ (8,900,000)
Deferred Revenue	(5,400,000)
Contract with Customer, Asset, Net	3,100,000
Prepaid Expense and Other Assets	$ 400,000