Preferred Stock - (Details) - USD ($)			12 Months Ended
	Oct. 01, 2019	Jan. 25, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jan. 31, 2018
Class of Stock [Line Items]
Preferred stock, shares authorized (in shares)			1,938,250
Preferred stock, shares issued (in shares)			1,829,582
Preferred stock, shares outstanding (in shares)			1,829,582
Accrued dividends on Series A-2 Preferred Stock			$ 4,000	$ 99,000
Proceeds from issuance of preferred stock gross			$ 0	$ 3,750,000
Preferred stock, convertible, par value (in dollars per share)			$ 0.0001
Common Stock, shares outstanding (in shares)			7,748,629	5,161,500
Maximum
Class of Stock [Line Items]
Preferred stock, shares authorized (in shares)			5,000,000
Common Stock
Class of Stock [Line Items]
Shares issued in conversion (in shares)			20,950
Conversion of convertible preferred stock, shares (in shares)			158,333	43,919
Issuance of restricted stock (in shares)			23,000	109,000
Restricted Stock
Class of Stock [Line Items]
Vesting period			10 years
Forfeited, restricted shares (in shares)				9,321
Unvested restricted shares outstanding (in shares)			627	627	11,320
Series A-2 Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares authorized (in shares)			7,500	7,500
Preferred stock, cumulative dividend percentage rate, per annum			5.00%
Preferred stock, shares issued (in shares)			45	32
Preferred stock, shares outstanding (in shares)			45	32
Preferred stock, stated value			$ 7,500	$ 7,500
Stock issued during period, conversion of convertible securities, price (in dollars per share)			$ 16.11
Convertible preferred stock, shares issued upon conversion (in shares)			466
Accrued dividends on Series A-2 Preferred Stock			$ 4,000	$ 99,000
Dividends			17,000
Payments of Dividends			$ 13,000
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%
Conversion price below this fair value of the common stock (in dollars per share)			$ 11.16
Preferred stock, convertible, par value (in dollars per share)			$ 0.0001	$ 0.0001
Conversion of convertible preferred stock, shares (in shares)			13
Series C Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares authorized (in shares)			1,750	1,750
Preferred stock, cumulative dividend percentage rate, per annum			0.00%
Preferred stock, shares issued (in shares)			0	475
Preferred stock, shares outstanding (in shares)			0	475
Preferred stock, stated value			$ 1,000	$ 1,000
Stock issued during period, conversion of convertible securities, price (in dollars per share)						$ 3.00
Proceeds from issuance of preferred stock gross		$ 1,750,000
Preferred stock, convertible, par value (in dollars per share)		$ 1,000	$ 0.0001	$ 0.0001
Series C Preferred Stock | Preferred Stock
Class of Stock [Line Items]
Conversion of convertible preferred stock, shares (in shares)			475	50
Series C Preferred Stock | Common Stock
Class of Stock [Line Items]
Conversion of convertible preferred stock, shares (in shares)			158,333	16,667
Series D Convertible Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares authorized (in shares)			4,000
Preferred stock, cumulative dividend percentage rate, per annum			0.00%
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, cumulative dividend percentage rate, per annum	6.00%		6.00%
Preferred stock, shares issued (in shares)			1,697,958	1,734,901
Preferred stock, shares outstanding (in shares)			1,697,958	1,734,901
Preferred stock, stated value	$ 28.50		$ 28.50	$ 28.50
Stock issued during period, conversion of convertible securities, price (in dollars per share)						2.85
Convertible preferred stock, shares issued upon conversion (in shares)	17,349,010
Undeclared dividends			$ 732,000
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		1,686,659
Forfeited, restricted shares (in shares)			28,618	1,725
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number			1,647,991
Series D Preferred Stock | Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares issued (in shares)			8,325
Series D Preferred Stock | Restricted Stock
Class of Stock [Line Items]
Issuance of restricted stock (in shares)	49,967		49,967
Vesting period	2 years		2 years
Forfeited, restricted shares (in shares)			29,694	1,725
Unvested restricted shares outstanding (in shares)			18,548
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number			49,967
Series E Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares authorized (in shares)			175,000	175,000
Preferred stock, cumulative dividend percentage rate, per annum			6.00%
Preferred stock, shares issued (in shares)			131,579	131,579
Preferred stock, shares outstanding (in shares)			131,579	131,579
Preferred stock, stated value			$ 28.50	$ 28.50
Undeclared dividends			$ 56,000
Preferred stock, convertible, par value (in dollars per share)			$ 0.0001	$ 0.0001
Series E Preferred Stock | Common Stock
Class of Stock [Line Items]
Common Stock, shares outstanding (in shares)			26,084,519
Series E Preferred Stock | Series E Financing
Class of Stock [Line Items]
Preferred stock, shares issued (in shares)			131,579
Stock issued during period, conversion of convertible securities, price (in dollars per share)						$ 2.85
Convertible preferred stock, shares issued upon conversion (in shares)			17,020,100
Forfeited, restricted shares (in shares)			0	0
Sale of Stock, Consideration Received on Transaction	$ 3,750,000		$ 3,750,000
Sale of stock, price per share (in dollars per share)	$ 28.50
Series E Preferred Stock | Series E Financing | Maximum
Class of Stock [Line Items]
Convertible preferred stock, shares issued upon conversion (in shares)			1,315,790
Series B Preferred Stock | Preferred Stock
Class of Stock [Line Items]
Conversion of convertible preferred stock, shares (in shares)				75