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Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Total revenues $ 139 $ 110 $ 401 $ 330
Costs and expenses:        
General and administrative 2,527 2,998 9,602 9,207
Depreciation 106 68 281 200
Total costs and expenses 2,633 3,066 9,883 9,407
Operating loss (2,494) (2,956) (9,482) (9,077)
Interest expense, net (1,920) (4,369) (7,166) (12,906)
Interest income 0 67 23 189
Loss before income taxes (4,414) (7,258) (29,019) (21,991)
Income tax expense (2) (1) (5) (4)
Loss from equity-method investments (77) (185) (776) (185)
Net loss and comprehensive loss applicable to common stock $ (4,493) $ (7,444) $ (29,800) $ (22,180)
Basic and diluted net loss per common share (in dollars per share) $ (0.13) $ (0.28) $ (0.89) $ (0.85)
Basic and diluted weighted average shares outstanding (in shares) 35,036 26,970 33,654 26,265
Total revenues $ 139 $ 110 $ 401 $ 330
Debt conversion expense     0 (197)
Loss on extinguishment of debt     $ (12,394) $ 0