Preferred Stock - Narrative (Details) - USD ($)			1 Months Ended		12 Months Ended
	Oct. 01, 2019	Jan. 25, 2018	Mar. 31, 2020	Oct. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Jan. 31, 2020	Sep. 30, 2019	Jan. 31, 2018
Class of Stock [Line Items]
Preferred stock, shares authorized (in shares)					5,000,000
Accrued dividends on Series A-2 Preferred Stock					$ 99,000	$ 71,000
Issuance of stock						$ 1,527,000
Common Stock, shares outstanding (in shares)					5,161,500	4,981,200
Common Stock
Class of Stock [Line Items]
Conversion of convertible preferred stock, shares (in shares)					44,000	542,000
Issuance of restricted stock (in shares)					109,000	56,000
Perpetual Series B-1 Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares authorized (in shares)					100
Preferred stock, shares issued (in shares)					0
Preferred stock, shares outstanding (in shares)					0
Series A-2 Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares authorized (in shares)					7,500	7,500
Preferred stock, shares issued (in shares)					32	32
Preferred stock, shares outstanding (in shares)					32	32
Preferred stock, stated value					$ 7,500	$ 7,500
Stock issued during period, conversion of convertible securities, price (in dollars per share)					$ 21.60
Convertible preferred stock, shares issued upon conversion (in shares)					347
Preferred stock, cumulative dividend percentage rate, per annum					5.00%
Accrued dividends on Series A-2 Preferred Stock					$ 99,000	$ 82,000
Redemption price per share (in dollars per share)					$ 8,250
Redemption price per share, multiplier (in dollars per share)					$ 7,500
Redemption price per share, multiplier, percentage					110.00%
Preferred stock, convertible, par value (in dollars per share)					$ 0.0001	$ 0.0001
Derivative liability					$ 0
Conversion price below this fair value of the common stock (in dollars per share)					$ 11.16
Series A-2 Preferred Stock | Subsequent Event
Class of Stock [Line Items]
Convertible preferred stock, shares issued upon conversion (in shares)							13.1524
Series B Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares authorized (in shares)					2,800	2,800
Preferred stock, shares issued (in shares)					0	75
Preferred stock, shares outstanding (in shares)					0	75
Preferred stock, stated value					$ 1,000	$ 1,000
Stock issued during period, conversion of convertible securities, price (in dollars per share)								$ 2.80
Preferred stock, cumulative dividend percentage rate, per annum					0.00%
Preferred stock, convertible, par value (in dollars per share)				$ 1,000	$ 0.0001	$ 0.0001
Series B Preferred Stock | Preferred Stock
Class of Stock [Line Items]
Issuance of stock (in shares)				2,800
Conversion of convertible preferred stock, shares (in shares)					75	375
Series B Preferred Stock | Common Stock
Class of Stock [Line Items]
Conversion of convertible preferred stock, shares (in shares)					26,786	133,929
Series C Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares authorized (in shares)					1,750	1,750
Preferred stock, shares issued (in shares)					475	525
Preferred stock, shares outstanding (in shares)					475	525
Preferred stock, stated value					$ 1,000	$ 1,000
Stock issued during period, conversion of convertible securities, price (in dollars per share)									$ 3.00
Preferred stock, cumulative dividend percentage rate, per annum					0.00%
Proceeds from issuance of preferred stock gross		$ 1,750,000			$ 0	$ 1,527,000
Preferred stock, convertible, par value (in dollars per share)		$ 1,000			$ 0.0001	$ 0.0001
Series C Preferred Stock | Subsequent Event
Class of Stock [Line Items]
Preferred stock, shares outstanding (in shares)			325
Preferred stock, stated value			$ 325,000
Series C Preferred Stock | Preferred Stock
Class of Stock [Line Items]
Issuance of stock (in shares)		1,750				1,750
Issuance of stock		$ 1,527,000
Conversion of convertible preferred stock, shares (in shares)					50	1,225
Series C Preferred Stock | Preferred Stock | Subsequent Event
Class of Stock [Line Items]
Conversion of convertible preferred stock, shares (in shares)			150
Series C Preferred Stock | Common Stock
Class of Stock [Line Items]
Conversion of convertible preferred stock, shares (in shares)					16,667	408,333
Series C Preferred Stock | Common Stock | Subsequent Event
Class of Stock [Line Items]
Conversion of convertible preferred stock, shares (in shares)			50,000
Series D Convertible Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares authorized (in shares)					4,000
Preferred stock, shares issued (in shares)					0
Preferred stock, shares outstanding (in shares)					0
Series D Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares authorized (in shares)					1,750,000	1,750,000
Preferred stock, shares issued (in shares)					1,734,901	0
Preferred stock, shares outstanding (in shares)					1,734,901	0
Preferred stock, stated value	$ 28.50				$ 28.50	$ 28.50
Convertible preferred stock, shares issued upon conversion (in shares)					17,349,010
Preferred stock, cumulative dividend percentage rate, per annum	6.00%				6.00%
Preferred stock, convertible, par value (in dollars per share)	$ 0.0001				$ 0.0001	$ 0.0001
Conversion of convertible preferred stock, shares (in shares)	1,686,659
Conversion price (in dollars per share)	$ 2.85
Perpetual Series B Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares authorized (in shares)					100
Preferred stock, shares issued (in shares)					0
Preferred stock, shares outstanding (in shares)					0
Series E Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares authorized (in shares)					175,000	175,000
Preferred stock, shares issued (in shares)					131,579	0
Preferred stock, shares outstanding (in shares)					131,579	0
Preferred stock, stated value					$ 28.50	$ 28.50
Convertible preferred stock, shares issued upon conversion (in shares)					1,315,790
Preferred stock, cumulative dividend percentage rate, per annum					6.00%
Proceeds from issuance of preferred stock gross					$ 3,750,000	$ 0
Preferred stock, convertible, par value (in dollars per share)					$ 0.0001	$ 0.0001
Series E Financing | Series E Preferred Stock
Class of Stock [Line Items]
Convertible preferred stock, shares issued upon conversion (in shares)	1,315,790
Sale of Stock, Consideration Received on Transaction	$ 3,750,000
Sale of stock, price per share (in dollars per share)	$ 28.5
Maximum | Series E Financing | Series E Preferred Stock
Class of Stock [Line Items]
Number of shares sold in transaction (in shares)	131,579
If Shares Had Been Converted
Class of Stock [Line Items]
Common Stock, shares outstanding (in shares)					23,826,300
Restricted Stock | Series D Preferred Stock
Class of Stock [Line Items]
Issuance of restricted stock (in shares)	49,967