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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
shares in Thousands, $ in Thousands
Common Stock [Member]
Preferred Stock [Member]
Series A Preferred Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Deficit [Member]
Total
Balance at Dec. 31, 2021 $ 13 $ 1 $ 166,190 $ (140,701) $ 25,503
Balance (in shares) at Dec. 31, 2021 2,601 156      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of common stock in connection with private offering $ 1 $ 0 (1) 0 0
Issuance of common stock in connection with private offering (in shares) 275 0      
Issuance of common stock from vested restricted stock units $ 0 $ 0 (5) 0 (5)
Issuance of common stock from vested restricted stock units (in shares) 2 0      
Forfeiture of unvested restricted stock $ 0 $ 0 0 0 0
Forfeiture of unvested restricted stock (in shares) (4) 0      
Issuance of common stock from exercise of pre-funded warrants $ 1 $ 0 874 0 874
Issuance of common stock from exercise of pre-funded warrants (in shares) 68 0      
Cash dividends to Series A preferred stockholders $ 0 $ 0 0 (8) (8)
Cash dividends to Series A preferred stockholders (in shares) 0 0      
Stock-based compensation $ 0 $ 0 2,538 0 2,539
Net loss 0 0 0 (20,090) (20,090)
Balance at Sep. 30, 2022 $ 15 $ 1 169,596 (160,799) 8,813
Balance (in shares) at Sep. 30, 2022 2,942 156      
Balance at Jun. 30, 2022 $ 14 $ 1 168,246 (153,483) 14,778
Balance (in shares) at Jun. 30, 2022 2,873 156      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of common stock from vested restricted stock units $ 0 $ 0 0 0 0
Issuance of common stock from vested restricted stock units (in shares) 1 0      
Issuance of common stock from exercise of pre-funded warrants $ 1 $ 0 874 0 875
Issuance of common stock from exercise of pre-funded warrants (in shares) 68 0      
Stock-based compensation $ 0 $ 0 476 0 476
Net loss 0 0 0 (7,316) (7,316)
Balance at Sep. 30, 2022 $ 15 $ 1 169,596 (160,799) 8,813
Balance (in shares) at Sep. 30, 2022 2,942 156      
Balance at Dec. 31, 2022 $ 26 $ 1 177,377 (165,297) 12,107
Balance (in shares) at Dec. 31, 2022 5,127 156      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of common stock in connection with Exacis asset acquisition $ 0 $ 0 208 0 208
Issuance of common stock in connection with Exacis asset acquisition (in shares) 69 0      
Issuance of common stock related to stock purchase agreement with Lincoln Park Capital Fund, LLC, net $ 1 $ 0 579 0 580
Issuance of common stock related to stock purchase agreement with Lincoln Park Capital Fund, LLC, net (in shares) 214 0      
Issuance of warrants in connection with the July 2023 Financing, net of fees $ 0 $ 0 5,113 0 5,113
Cash dividends to Series A preferred stockholders $ 0 $ 0 0 (8) (8)
Cash dividends to Series A preferred stockholders (in shares) 0 0      
Stock-based compensation $ 0 $ 0 1,077 0 1,077
Net loss 0 0 0 (15,515) (15,515)
Balance at Sep. 30, 2023 $ 27 $ 1 184,354 (180,820) 3,562
Balance (in shares) at Sep. 30, 2023 5,410 156      
Balance at Jun. 30, 2023 $ 27 $ 1 179,067 (175,229) 3,866
Balance (in shares) at Jun. 30, 2023 5,410 156      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of warrants in connection with the July 2023 Financing, net of fees $ 0 $ 0 5,113 0 5,113
Stock-based compensation 0 0 174 0 174
Net loss 0 0 0 (5,591) (5,591)
Balance at Sep. 30, 2023 $ 27 $ 1 $ 184,354 $ (180,820) $ 3,562
Balance (in shares) at Sep. 30, 2023 5,410 156