Preferred Stock and Warrants - Additional Information (Details) - USD ($)				12 Months Ended
	Jun. 06, 2021	Nov. 07, 2019	Mar. 26, 2018	Mar. 30, 2019
Class of Stock [Line Items]
Stock issued during period, shares, new issues (in shares)	46,154
Shares issued, price per share (in dollars per share)	$ 3.25
Conversion of Series E Preferred Stock into Common Stock [Member]
Class of Stock [Line Items]
Conversion of stock, shares issued (in shares)		896,636
Conversion of series E preferred stock to common stock (in shares)		88,600
Series E Preferred Stock [Member]
Class of Stock [Line Items]
Stock issued during period, shares, new issues (in shares)			42,800	56,200
Proceeds from issuance of preferred stock and preference stock			$ 1,100,000	$ 1,405,000
Preferred stock, dividend rate, percentage			6.00%
Proceeds from issuance of preferred stock and preference stock, net of issuance costs			$ 1,000,000.0	1,200,000
Payments of stock issuance costs				$ 212,000
Shares issued, price per share (in dollars per share)			$ 25.00