Summary of Significant Accounting Policies - Additional Information (Details) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accounts receivable, net of allowances	$ 1,626,889	$ 1,626,889		$ 4,168,015
Contract assets	2,100,000	2,100,000		0
Contract assets, net	939,930	939,930		0
Write-offs in accounts receivable	0	400,000
Write-offs in contract assets account	0	0
Deferred revenue	9,572,434	$ 9,572,434		$ 18,360,690
Revenue expected to be recognized during next 12 months		72.00%
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract assets			$ 3,100,000
Contract assets, net	$ 939,930	$ 939,930
Deferred revenue			$ (5,400,000)