Stockholders' Equity - Series B Convertible Preferred Stock (Details) - USD ($)		3 Months Ended	12 Months Ended
	Jun. 12, 2018	Jun. 30, 2018	Dec. 31, 2019	Dec. 31, 2018
Class of Stock [Line Items]
Proceeds from sale of common stock and warrants, net of expenses of $158,678 and $1,336,123 respectively			$ 8,817,772	$ 11,779,525
Payments of stock issuance costs	$ 1,800,000
Sale of stock, net of expenses (in shares)			1,994,929
Warrants granted (in shares)			7,437,454	3,450,000
Preferred stock, par value (in dollars per share)			$ 0.001	$ 0.001
Shares issued upon conversion (in shares)			333,333
Series B Convertible Preferred Stock
Class of Stock [Line Items]
Payments of stock issuance costs			$ 0	$ 497,617
Deemed dividend recognized for beneficial conversion features of Series B Convertible Preferred Stock issuance		$ 2,800,000	$ 0	$ 2,769,533
Preferred stock, shares outstanding (in shares)			0	0
Common Stock
Class of Stock [Line Items]
Sale of stock, net of expenses (in shares)			4,761,754
Shares issued upon conversion (in shares)	1,476,667			1,476,667
Underwriting Public Offering
Class of Stock [Line Items]
Proceeds from sale of common stock and warrants, net of expenses of $158,678 and $1,336,123 respectively	$ 18,000,000
Warrants granted (in shares)	3,450,000
Exercise price of warrants (in dollars per share)	$ 6.60
Underwriting Public Offering | Common Stock
Class of Stock [Line Items]
Sale of stock, net of expenses (in shares)	1,523,333		183,334	1,523,333
Offering price (in dollars per share)	$ 6.00
Underwriting Public Offering | Common Stock | Series B Convertible Preferred Stock
Class of Stock [Line Items]
Conversion ratio	166.6667
Underwriting Public Offering | Series B Convertible Preferred Stock
Class of Stock [Line Items]
Sale of stock, net of expenses (in shares)	8,860
Preferred stock, par value (in dollars per share)	$ 1,000
Over-Allotment Option
Class of Stock [Line Items]
Warrants granted (in shares)	450,000