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Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Total revenues $ 130 $ 142
Costs and expenses:    
General and administrative 3,953 3,806
Depreciation 329 121
Total costs and expenses 4,282 3,927
Operating loss (4,152) (3,785)
Interest expense (1,504) (1,991)
Interest income 168 0
Gain on derivative liability 130 0
Loss on early extinguishment of debt (5,331) 0
Loss before income taxes (10,689) (5,776)
Income tax expense (2) (2)
Loss from equity-method investments 0 (134)
Net loss and comprehensive loss (10,691) (5,912)
Less: Preferred stock dividend (1,265) (1,265)
Net loss and comprehensive loss applicable to common stock $ (11,956) $ (7,177)
Basic and diluted net loss per common share (in dollars per share) $ (0.19) $ (0.16)
Basic and diluted weighted average shares outstanding (in shares) 62,638 44,433