Quarterly report pursuant to Section 13 or 15(d)

Condensed Consolidated Balance Sheets (Unaudited) (Parentheticals)

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Condensed Consolidated Balance Sheets (Unaudited) (Parentheticals) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
[1]
Accounts receivable, allowance for doubtful accounts $ 126 $ 124
Convertible preferred stock, shares authorized (in shares) 10,000,000 10,000,000
Common stock, par value (in dollars per share) $ 0.0001 $ 0.0001
Common stock, shares authorized (in shares) 75,000,000 75,000,000
Common stock, shares issued (in shares) 10,341,716 2,171,316
Common stock, shares outstanding (in shares) 10,341,716 2,171,316
Series B Preferred Stock [Member]    
Convertible preferred stock, par value (in dollars per share) $ 0.0001 $ 0.0001
Convertible preferred stock, shares issued (in shares) 36,937 35,819
Convertible preferred stock, shares outstanding (in shares) 36,937 35,819
Series C Preferred Stock [Member]    
Convertible preferred stock, par value (in dollars per share) $ 0.0001 $ 0.0001
Convertible preferred stock, shares issued (in shares) 0  
Convertible preferred stock, shares outstanding (in shares) 0  
[1] The condensed consolidated balance sheet as of December 31, 2020 has been derived from the audited consolidated financial statements as of that date.