Stockholders' Equity - Series E Convertible Preferred Stock (Details) - USD ($)								3 Months Ended		6 Months Ended
	Jun. 15, 2020	May 26, 2020	May 14, 2020	May 11, 2020	May 08, 2020	Apr. 09, 2020	Mar. 30, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Jan. 25, 2019
Class of Stock [Line Items]
Sale of stock, number of shares issued (in shares)		1,205,400	146,854	447,761		904,970	800,000
Number of shares called by warrants (in shares)	2,213,115
Exercise price of warrants (in USD per share)	$ 3.05
Months until exercisable					6 months
Deemed dividend recognized for beneficial conversion features of Convertible Preferred Stock issuance					$ 2,700,000
Warrants issued (in shares)	184,426
Expiration term					5 years 6 months
Warrants, fair value	$ 370,666							$ 370,666
Series N Warrant
Class of Stock [Line Items]
Exercise price of warrants (in USD per share)	$ 2.39
Months until exercisable					6 months
Series E Convertible Preferred Stock
Class of Stock [Line Items]
Par value (in dollars per share)	10							$ 0.001		$ 0.001
Conversion price (in dollars per share)	$ 2.44
Preferred stock, shares outstanding (in shares)								865,824		865,824		0
Deemed dividend recognized for beneficial conversion features of Convertible Preferred Stock issuance								$ 2,664,717	$ 0	$ 2,664,717	$ 0
Registered Direct Offering
Class of Stock [Line Items]
Sale of stock, number of shares issued (in shares)	1,984,328
Private Placement
Class of Stock [Line Items]
Number of shares called by warrants (in shares)					859,813
Exercise price of warrants (in USD per share)					$ 1.50								$ 3.762
Private Placement | Series E Convertible Preferred Stock
Class of Stock [Line Items]
Sale of stock, number of shares issued (in shares)	865,824