Consolidated Balance Sheets (Parenthetical) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Accounts receivable allowance, net	$ 272,000	$ 235,000
Preferred stock, par value (in usd per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Common stock, par value (in usd per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	2,000,000,000	2,000,000,000
Common stock, shares issued (in shares)	124,440,924	53,178,462
Common stock, shares outstanding (in shares)	124,440,923	53,178,462
Treasury stock (in shares)	1
Series 7 Preferred Stock
Mezzanine equity, convertible preferred stock, shares authorized (in shares)	58,750	58,750
Mezzanine equity, convertible preferred stock, shares issued (in shares)	49,250	0
Mezzanine equity, convertible preferred stock, shares outstanding (in shares)	49,250	0
Mezzanine equity, convertible preferred stock, liquidation preference	$ 49,250,000	$ 49,250,000
Preferred stock, shares issued (in shares)	49,250
Preferred stock, shares outstanding (in shares)	49,250
Series 4 Convertible Preferred Stock
Preferred stock, shares authorized (in shares)	10,415	10,415
Preferred stock, shares issued (in shares)	1	1
Preferred stock, shares outstanding (in shares)	1	1
Series 5 Convertible Preferred Stock
Preferred stock, shares authorized (in shares)	12,000	12,000
Preferred stock, shares issued (in shares)	126	126
Preferred stock, shares outstanding (in shares)	126	126