Revenue - Dual Reporting (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Jan. 01, 2018	Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accounts receivable, net	$ 6,811,029		$ 6,811,029		$ 3,739,430	$ 3,647,025
Contract with customer, liability, current	(5,631,096)		(5,631,096)		(3,261,729)	0
Unearned revenue	0		0			3,070,502
Accumulated deficit	(52,401,946)		(52,401,946)			$ (47,277,420)
Revenue from contract with customer, excluding assessed tax	5,780,941	$ 7,089,855	13,798,342	$ 17,637,264
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accounts receivable, net	156,315		156,315		92,405
Contract with customer, liability, current	(5,631,096)		(5,631,096)
Unearned revenue	5,659,184		5,659,184		191,227
Accumulated deficit	128,227		128,227		(98,822)
Revenue from contract with customer, excluding assessed tax	16,459		29,405
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accounts receivable, net	6,967,344		6,967,344		3,739,430
Contract liabilities	0		0
Unearned revenue	5,659,184		5,659,184		3,261,729
Accumulated deficit	(52,273,719)		(52,273,719)		$ (47,376,242)
Revenue from contract with customer, excluding assessed tax	$ 5,797,400		$ 13,827,747