Summary of Significant Accounting Policies - Summary of Contract Assets and Liabilities (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Total deferred revenue	$ 6,232,687	$ 6,314,632
Less: Long-term deferred revenue	(407,151)	(611,863)
Total current deferred revenue	5,825,536	5,702,769
Contract Assets - Unbilled Receivables [Member]
Total deferred revenue	251,867	2,917
Customer Deposits [Member]
Total deferred revenue	487,086
Product Shipped, Revenue Deferred [Member]
Total deferred revenue	645,199	941,724
Deferred Service and License Fees [Member]
Total deferred revenue	$ 5,100,402	$ 5,372,908