Annual report pursuant to Section 13 and 15(d)

CONSOLIDATED STATEMENTS OF CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT)

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CONSOLIDATED STATEMENTS OF CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT) - USD ($)
$ in Thousands
Preferred Stock
Convertible Preferred Stock
Common Shares
Additional Paid-in Capital
Accumulated Deficit
ASC 842 adoption adjustment
Accumulated Deficit
ASC 842 adoption adjustment
Total
Balance at Dec. 31, 2020 $ 597 $ 1 $ 207,698   $ (200,383)   $ 7,316
Balance (in shares) at Dec. 31, 2020 250,000 84,142          
Issuance of common stock upon warrant exercise     8,303       8,303
Issuance of common stock upon warrant exercise (in shares)   34,655          
Warrants issued in connection with warrant exercise     1,146       1,146
Convertible preferred stock dividend $ 34   (34)       (34)
Exchange of convertible preferred stock for common stock $ (631)   1,640       1,640
Exchange of convertible preferred stock for common stock (in shares) (250,000) 2,500          
Warrants issued upon exchange of preferred stock for common stock     570       570
Deemed dividend on exchange of convertible preferred stock for common stock     (1,192)       (1,192)
Stock-based compensation     1,346       1,346
Stock-based compensation (in shares)   9,745          
Issuance of common stock to vendor     34       34
Issuance of common stock to vendor (in shares)   100          
Release of vested restricted common stock (in shares)   2,168          
Registered direct offering, net of issuance costs   $ 1 9,025       9,026
Registered direct offering, net of issuance costs (in shares)   25,000          
Issuance of warrants in exchange for services     42       42
Net loss         (11,820)   (11,820)
Balance at Dec. 31, 2021 $ 0 $ 2 228,578   (212,203)   16,377
Balance (in shares) at Dec. 31, 2021 0 158,310          
Stock-based compensation     2,027       2,027
Stock-based compensation (in shares)   12,749          
Release of vested restricted common stock (in shares)   2,108          
Restricted stock awards cancelled (in shares)   (603)          
Issuance of warrants in connection with convertible promissory note     91       91
Issuance of common stock and warrants, net of offering costs   $ 5 6,426       6,431
Issuance of common stock and warrants, net of offering costs (in shares)   540,000          
Issuance of warrants in connection with December 2022 offering     (10,804)       (10,804)
Net loss         (16,151)   (16,151)
Balance at Dec. 31, 2022 $ 0 $ 7 $ 226,318 $ 33 $ (228,321) $ 33 $ (1,996)
Balance (in shares) at Dec. 31, 2022 0 712,564