Summary of Significant Accounting Policies - Summary of Contract Assets and Liabilities (Details) - USD ($)	Sep. 30, 2019	Dec. 31, 2018
Total deferred revenue	$ 5,844,291	$ 6,232,687
Less: Long-term deferred revenue	(560,508)	(407,151)
Total current deferred revenue	5,283,783	5,825,536
Contract Assets - Unbilled Receivables [Member]
Total deferred revenue	314,494	251,867
Customer Deposits [Member]
Total deferred revenue	41,860	487,086
Product Shipped, Revenue Deferred [Member]
Total deferred revenue	645,199	645,199
Deferred Service and License Fees [Member]
Total deferred revenue	$ 5,157,232	$ 5,100,402