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Condensed Consolidated Statements of Changes in Stockholder' Equity (Deficit) - USD ($)
$ in Thousands
Common Stock
Additional Paid-In Capital
Accumulated Deficit
Total
Beginning balance (note 1), value at Dec. 31, 2022 $ 4 $ 204,129 $ (214,744) $ (10,611)
Beginning balance (note 1), (in shares) at Dec. 31, 2022 3,572,271      
Stock-based compensation expense   1,062   1,062
Issuance of common stock for prepaid services   190   190
Issuance of common stock for prepaid services (in shares) 8,334      
Repurchase and retirement of common stock (in shares) (33,334)      
Issuance of common stock, net of issuance costs   12   12
Issuance of common stock, net of issuance costs (in shares) 401,978      
Issuance of common stock for payment of convertible notes payable and interest   1,991   1,991
Issuance of common stock for payment of convertible notes payable and interest (in shares) 105,538      
Issuance of common stock in at-the-market offering, net of issuance costs   68   68
Issuance of common stock in at-the-market offering, net of issuance costs (in shares) 2,527      
Issuance of common stock, ESPP   61   61
Issuance of common stock, ESPP (in shares) 3,056      
Net income (loss)     (13,431) (13,431)
Ending balance (note 1), value at Mar. 31, 2023 $ 4 207,513 (228,175) (20,658)
Ending balance (note 1), (in shares) at Mar. 31, 2023 4,060,370      
Beginning balance (note 1), value at Dec. 31, 2023 $ 10 219,106 (252,626) $ (33,510)
Beginning balance (note 1), (in shares) at Dec. 31, 2023 9,794,594     9,794,594
Stock-based compensation expense   955   $ 955
Issuance of common stock for payment of convertible notes payable and interest $ 2 1,518   1,520
Issuance of common stock for payment of convertible notes payable and interest (in shares) 2,054,082      
Issuance of common stock and warrants, net of issuance costs $ 3 588   591
Issuance of common stock and warrants, net of issuance costs (in shares) 3,404,256      
Issuance of common stock, ESPP   4   4
Issuance of common stock, ESPP (in shares) 3,336      
Net income (loss)     (2,664) (2,664)
Ending balance (note 1), value at Mar. 31, 2024 $ 15 $ 222,171 $ (255,290) $ (33,104)
Ending balance (note 1), (in shares) at Mar. 31, 2024 15,256,268     15,256,268