Stock-Based Compensation - Stock-based Compensation Expense (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Stock-based compensation expense	$ 2,301,497	$ 1,991,755	$ 3,921,875	$ 3,405,490
Cost of Revenues [Member]
Stock-based compensation expense	82,893	101,999	151,489	164,752
General and administrative expense
Stock-based compensation expense	1,442,467	1,343,984	2,517,636	2,284,123
Selling and Marketing Expense [Member]
Stock-based compensation expense	601,319	443,253	969,647	782,328
Engineering And Development [Member]
Stock-based compensation expense	$ 174,818	$ 102,519	$ 283,103	$ 174,287