Summary of Significant Accounting Policies - Additional Information (Details) - USD ($)	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accounts receivable, net of allowances	$ 2,068,998	$ 2,068,998		$ 4,168,015
Contract assets	2,900,000	2,900,000		0
Contract assets, net	1,460,494	1,460,494		0
Write-offs in accounts receivable	0	400,000
Write-offs in contract assets account	0	0
Deferred revenue	11,671,762	$ 11,671,762		$ 18,360,690
Revenue expected to be recognized during next 12 months		62.00%
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	$ 1,460,494	$ 1,460,494
Deferred revenue			$ (5,400,000)