Quarterly report pursuant to Section 13 or 15(d)

Condensed Consolidated Balance Sheets (Parenthetical)

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Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares
Mar. 31, 2024
Dec. 31, 2023
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized (in shares) 48,043,098 48,043,098
Common stock, shares issued (in shares) 35,838,442 35,838,442
Common stock, shares outstanding (in shares) 35,838,442 35,838,442
Series D Preferred Stock    
Preferred stock, par value (in dollars per share) $ 0.001 $ 0.001
Preferred stock, liquidation preference (in dollars per share) $ 25.00 $ 25.00
Preferred stock, shares authorized (in shares) 3,600,000 3,600,000
Preferred stock, shares issued (in shares) 2,415,000 2,415,000
Preferred stock, shares outstanding (in shares) 2,415,000 2,415,000
Series B Preferred Stock    
Preferred stock, par value (in dollars per share) $ 0.001 $ 0.001
Preferred stock, liquidation preference (in dollars per share) $ 25.00 $ 25.00
Preferred stock, shares authorized (in shares) 6,456,065 6,456,065
Preferred stock, shares issued (in shares) 5,956,065 5,956,065
Preferred stock, shares outstanding (in shares) 5,956,065 5,956,065
Series C Preferred Stock    
Preferred stock, par value (in dollars per share) $ 0.001 $ 0.001
Preferred stock, liquidation preference (in dollars per share) $ 25.00 $ 25.00
Preferred stock, shares authorized (in shares) 25,902,437 25,902,437
Preferred stock, shares issued (in shares) 10,156,509 10,156,509
Preferred stock, shares outstanding (in shares) 10,156,509 10,156,509
Series E Preferred Stock    
Preferred stock, par value (in dollars per share) $ 0.001 $ 0.001
Preferred stock, liquidation preference (in dollars per share) $ 25.00 $ 25.00
Preferred stock, shares authorized (in shares) 15,998,400 15,998,400
Preferred stock, shares issued (in shares) 247,181 235,841
Preferred stock, shares outstanding (in shares) 247,181 235,841