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CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Mar. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Current assets:          
Cash and cash equivalents $ 7,740 $ 17,909   $ 77,605  
Prepaid expenses and other assets 2,901 5,916   2,866  
Total current assets 13,954 23,825   80,471  
Property and equipment, net 0 4,385   6,764  
Right of use assets - operating leases 1,999 2,040   2,173  
Deferred financing costs 0 208   146  
Total assets 15,953 30,458   89,554  
Current liabilities:          
Accounts payable 3,251 2,081   3,933  
Accrued expenses 4,705 7,448   7,662  
Deferred revenue 0 3,729   1,413  
Operating lease liabilities 998 832   1,391  
Finance lease liabilities 640 905   544  
Other current liabilities 853 1,060   965  
Total current liabilities 10,447 16,055   15,908  
Deferred revenue 41,250 41,250   45,000  
Operating lease liabilities 687 724   860  
Finance lease liabilities 0 20   328  
Other long-term liabilities 231 318   926  
Total liabilities 52,615 58,367   63,022  
Commitments and contingencies (Note 8)    
Stockholders' (deficit) equity:          
Preferred stock $0.001 par value, 5,000,000 shares authorized, none issued or outstanding 0 0   0  
Common stock $0.001 par value, 350,000,000 shares authorized, 41,750,109 and 40,609,915 shares issued and outstanding at December 31, 2024 and 2023, respectively 41 41   40  
Additional paid-in capital 278,142 277,629   271,594  
Accumulated deficit (314,845) (305,579)   (245,102)  
Total stockholders' deficit (36,662) (27,909) $ 10,895 26,532 $ (142,670)
Total liabilities and stockholders' deficit $ 15,953 $ 30,458   $ 89,554