Stockholders' Equity - Series C Convertible Preferred Stock (Details) - USD ($)		1 Months Ended		3 Months Ended		6 Months Ended
	Jan. 25, 2019	Apr. 30, 2019	Jan. 31, 2019	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Class of Stock [Line Items]
Warrants granted (in shares)						1,408,510
Service receivable	$ 1,675,000			$ 1,364,234		$ 1,364,234		$ 0
Shares issued upon conversion (in shares)		333,333				333,333
Series C Convertible Preferred Stock
Class of Stock [Line Items]
Deemed dividend recognized for beneficial conversion features of Series C Convertible Preferred Stock issuance				$ 0	$ 0	$ 268,269	$ 0
Preferred stock, shares outstanding (in shares)				0		0		0
Private Placement
Class of Stock [Line Items]
Proceeds from sales of common stock and warrants, net of expenses of $1,336,123 and $575,516, respectively	$ 1,675,000		$ 1,675,000
Warrants granted (in shares)	150,000
Exercise price of warrants (in USD per share)	$ 3.762
Common Stock
Class of Stock [Line Items]
Shares of common stock issued (in shares)						1,609,511
Exercise price of warrants (in USD per share)				$ 6.60		$ 6.60
Common Stock | Private Placement
Class of Stock [Line Items]
Shares of common stock issued (in shares)	183,334
Shares issued upon conversion (in shares)	1.67
Series C Convertible Preferred Stock
Class of Stock [Line Items]
Shares converted (in shares)		200,000
Series C Convertible Preferred Stock | Private Placement
Class of Stock [Line Items]
Shares of common stock issued (in shares)	200,000