Stock-Based Compensation - Share-based compensation expense (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total share based compensation expense	$ (1,461,014)	$ 1,501,326	$ (526,168)	$ 3,018,628
Service based awards
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total share based compensation expense	332,386	974,611	1,010,125	1,970,986
Restricted stock units - Service based awards
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total share based compensation expense	(4,127)	427,472	233,987	771,823
Stock option awards - Service based awards
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total share based compensation expense	336,513	547,139	776,138	1,199,163
Performance based awards
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total share based compensation expense	(1,793,400)	526,715	(1,536,293)	1,047,642
Restricted stock units - Performance based awards
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total share based compensation expense	(1,196,713)	402,814	(1,025,502)	801,202
Stock option awards - Performance based awards
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total share based compensation expense	$ (596,687)	$ 123,901	$ (510,791)	$ 246,440