Stockholders' Equity and Derivative Liability - Warrants - Series C Preferred Stock Issuances and Beneficial Conversion Feature (Details)		3 Months Ended		12 Months Ended
	Jul. 03, 2018 USD ($) $ / shares shares	Mar. 31, 2020 USD ($) item $ / shares shares	Mar. 31, 2019 shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) shares
Preferred stock, Common Stock and Warrant Offering
Deemed dividend | $				$ 77,721	$ 4,700,000
Warrants
Preferred stock, Common Stock and Warrant Offering
Warrants issued (in shares)	88,928
Common Stock
Preferred stock, Common Stock and Warrant Offering
Issuance of stock (in shares)		2,311,867
Conversion of preferred stock to common (in shares)			424
Stock issued as a result of conversion (in shares)				1,353	81,585
Over-Allotment Option
Preferred stock, Common Stock and Warrant Offering
Fair value of warrants | $	$ 200,000
Series C
Preferred stock, Common Stock and Warrant Offering
Preferred stock issued (in shares)		1,827		1,827
Stock Issuance Costs | $					$ 500,000
Convertible preferred stock, par value | $ / shares	$ 1,000	$ 1,000		$ 1,000
Issuance of stock (in shares)	10,826
Consecutive trading days | item		10
Proceeds from issuance of preferred stock | $	$ 9,900,000
Offering costs | $	$ 900,000
Redemption price per warrant | $ / shares	$ 0.70
Required common stock price to redeem warrants | $ / shares	434.00
Beneficial conversion amount accreted back as preferred stock | $		$ 3,800,000			$ 3,800,000
Preferred shares converted (in shares)				147
Conversion of preferred stock to common (in shares)					8,852
Percentage of preferred stock convertible immediately					100.00%
Series C | Warrants
Preferred stock, Common Stock and Warrant Offering
Exercise price per share | $ / shares	$ 108.50
Series C | Preferred Stock
Preferred stock, Common Stock and Warrant Offering
Preferred stock issued (in shares)	1
Conversion of preferred stock to common (in shares)			(46)
Series C | Over-Allotment Option
Preferred stock, Common Stock and Warrant Offering
Warrants offered placement fee	3,991
Stock price | $ / shares	$ 119.70
Fair value of warrants | $	$ 100,000
Series C | Over-Allotment Option | Warrants
Preferred stock, Common Stock and Warrant Offering
Fair value of warrants | $	$ 100,000