Restructuring Costs - Schedule of Restructuring Costs (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Restructuring Reserve [Roll Forward]
Provisions/Additions	$ 1,261,578	$ (159,597)
Restructuring Plan 2013 and 2017
Restructuring Reserve [Roll Forward]
Beginning Balance	648,399	846,337	$ 732,662	$ 1,028,915	$ 1,306,493	$ 3,606,020
Utilized/Paid	(995,169)	(38,341)	(63,714)	(469,248)	(1,412,888)	(2,299,527)
Provisions/Additions	1,261,578	(159,597)	177,389	172,995	1,135,310
Ending Balance	914,808	648,399	846,337	732,662	1,028,915	1,306,493
Severance related costs | Restructuring Plan 2013 and 2017
Restructuring Reserve [Roll Forward]
Beginning Balance	648,399	846,337	717,640	823,426	1,111,577	3,179,131
Utilized/Paid	(13,773)	(38,341)	(36,531)	(161,313)	(653,325)	(2,067,554)
Provisions/Additions	(173,265)	(159,597)	165,228	55,527	365,174
Ending Balance	461,361	648,399	846,337	717,640	823,426	1,111,577
Facility and other costs | Restructuring Plan 2013 and 2017
Restructuring Reserve [Roll Forward]
Beginning Balance	0	0	15,022	205,489	194,916	426,889
Utilized/Paid	(981,396)	0	(27,183)	(307,935)	(759,563)	(231,973)
Provisions/Additions	1,434,843	0	12,161	117,468	770,136
Ending Balance	$ 453,447	$ 0	$ 0	$ 15,022	$ 205,489	$ 194,916