Derivatives and Hedging Activities - Fair Value of Derivatives and Balance Sheet Classification (Details) - Designated as hedging instrument - USD ($)	Jun. 30, 2019	Dec. 31, 2018
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 762,758	$ 972,784
Liability Derivatives	(231,092)	(940,216)
Interest rate products | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	1,451	166,058
Liability Derivatives	0	0
Interest rate products | Other assets - non-current
Derivatives, Fair Value [Line Items]
Asset Derivatives	368	53,355
Liability Derivatives	(3,540)	0
Cross currency contract | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	760,939	753,371
Liability Derivatives	0	0
Cross currency contract | Other assets - non-current
Derivatives, Fair Value [Line Items]
Asset Derivatives	0	0
Cross currency contract | Long-term derivative liability
Derivatives, Fair Value [Line Items]
Liability Derivatives	$ (227,552)	$ (940,216)