Preferred Stock (Details) - USD ($)	1 Months Ended	3 Months Ended			9 Months Ended
	Jan. 31, 2018	Mar. 31, 2019	Sep. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Class of Stock [Line Items]
Preferred stock, convertible, shares authorized (in shares)					5,000,000
Accrued dividends on Series A-2 Preferred Stock					$ 94,000		$ 71,000
Proceeds from issuance of preferred stock gross					$ 0	$ 1,527,000
Common Stock
Class of Stock [Line Items]
Stock issued for conversion of convertible preferred stock, shares (in shares)		43,000	167,000	185,000
Perpetual Series B-1 Preferred Stock
Class of Stock [Line Items]
Preferred stock, convertible, 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, convertible, 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, cumulative dividend percentage rate, per annum					5.00%
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
Accrued dividends on Series A-2 Preferred Stock					$ 94,000
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%
Stated value (in dollars per share)					$ 0.0001		$ 0.0001
Derivative liability					$ 0
Series B Preferred Stock
Class of Stock [Line Items]
Preferred stock, convertible, 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, cumulative dividend percentage rate, per annum					0.00%
Preferred stock, stated value					$ 1,000		$ 1,000
Stock issued during period, conversion of convertible securities, price (in dollars per share)					$ 2.80
Stated value (in dollars per share)					$ 0.0001		$ 0.0001
Series B Preferred Stock | Preferred Stock
Class of Stock [Line Items]
Stock issued for conversion of convertible preferred stock, shares (in shares)		(75)		(75)	75
Series B Preferred Stock | Common Stock
Class of Stock [Line Items]
Stock issued for conversion of convertible preferred stock, shares (in shares)					26,786
Series C Preferred Stock
Class of Stock [Line Items]
Preferred stock, convertible, 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, cumulative dividend percentage rate, per annum					0.00%
Preferred stock, stated value					$ 1,000		$ 1,000
Stock issued during period, conversion of convertible securities, price (in dollars per share)	$ 3.0
Proceeds from issuance of preferred stock gross	$ 1,750,000
Stated value (in dollars per share)	$ 1,000				$ 0.0001		$ 0.0001
Participation rights, future offerings, max percentage	100.00%
Series C Preferred Stock | Preferred Stock
Class of Stock [Line Items]
Stock issued for conversion of convertible preferred stock, shares (in shares)		(50)	(500)	(475)	50
Issuance of stock (in shares)	1,750			1,750
Series C Preferred Stock | Common Stock
Class of Stock [Line Items]
Convertible preferred stock, shares issued upon conversion (in shares)					158,333
Stock issued for conversion of convertible preferred stock, shares (in shares)					16,667
Series D Preferred Stock
Class of Stock [Line Items]
Preferred stock, convertible, shares authorized (in shares)					4,000
Preferred stock, shares issued (in shares)					0
Preferred stock, shares outstanding (in shares)					0
Perpetual Series B Preferred Stock
Class of Stock [Line Items]
Preferred stock, convertible, shares authorized (in shares)					100
Preferred stock, shares issued (in shares)					0
Preferred stock, shares outstanding (in shares)					0