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