Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Accounts receivable allowance, net	$ 334	$ 235
Inventory obsolescence reserve	$ 437	$ 138
Preferred stock, par value (in usd per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred stock, shares issued (in shares)	49,250
Preferred stock, shares outstanding (in shares)	49,250
Common stock, par value (in usd per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	250,000,000	250,000,000
Common stock, shares issued (in shares)	124,593,720	53,178,462
Common stock, shares outstanding (in shares)	124,593,719	53,178,461
Treasury stock (in shares)	1	1
Series 7 Convertible Preferred Stock
Mezzanine equity, convertible preferred stock, shares authorized (in shares)	58,750	58,750
Mezzanine equity, convertible preferred stock, shares outstanding (in shares)	49,250	0
Mezzanine equity, convertible preferred stock, shares issued (in shares)	49,250	0
Mezzanine equity, convertible preferred stock, liquidation preference	$ 49,250	$ 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