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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Allowance for doubtful accounts receivable $ 1,384 $ 2,133
Preferred stock, par value (in dollars per share) $ 0.001 $ 0.001
Preferred stock, shares authorized 2,000,000 2,000,000
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized 150,000,000 150,000,000
Common stock, shares issued 99,399,029 81,974,051
Common stock, shares outstanding 99,399,029 81,974,051
Series E preferred shares    
Preferred stock, par value (in dollars per share) $ 0.001 $ 0.001
Preferred stock, shares authorized 39,500 10,000
Preferred stock, shares issued 35,000 10,000
Preferred stock, shares outstanding 35,000 10,000
Preferred stock, liquidation preference per share (in dollars per share) $ 1,000 $ 1,000