Revenue Recognition - Additional information (Details) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Sep. 30, 2018	[1]	Jan. 01, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Impairment losses from CSSE contracts with customers	$ 0	$ 0
Bad debt expense		1,241,243	$ 714,506
Contract Liabilities	$ 0	$ 0			$ 6,469	$ 6,469
Maximum [Member]
Disaggregation of Revenue [Line Items]
Payment term		60 days
Minimum [Member]
Disaggregation of Revenue [Line Items]
Payment term		30 days

[1] *     In accordance with ASC Subtopic 80550 "Transactions between entities under common control", results of operations for the 2018 period have been retrospectively adjusted for the acquisition of A Plus on December 28, 2018 to furnish comparative information as required. The effects of intra-entity transactions have been eliminated as a part of the consolidation, where applicable.