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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Allowance for doubtful accounts $ 1,260 $ 0
Preferred stock, authorized 65,000 65,000
Preferred stock, shares issued 1,323 1,323
Preferred stock, shares outstanding 1,323 1,323
Common stock, par value $ 0.001 $ 0.001
Common stock, shares authorized 40,000 40,000
Common stock, shares issued 22,830 20,570
Common stock, shares outstanding 22,830 20,570
Series B Preferred Stock    
Preferred stock, par value $ 0.001 $ 0.001
Preferred stock, authorized 7,235 7,235
Preferred stock, shares issued 1,323 1,323
Preferred stock, shares outstanding 1,323 1,323
Aggregate liquidation preference $ 3,969 $ 3,969