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CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Current assets:              
Cash and cash equivalents $ 1,999   $ 17,909     $ 77,605  
Prepaid expenses and other assets 2,285   5,916     2,866  
Total current assets 4,295   23,825     80,471  
Property and equipment, net 0   4,385     6,764  
Right of use assets - operating leases 717   2,040     2,173  
Deferred financing costs 0   208     146  
Total assets 5,012   30,458     89,554  
Current liabilities:              
Accounts payable 4,757   2,081     3,933  
Accrued expenses 2,528   7,448     7,662  
Deferred revenue 0   3,729     1,413  
Operating lease liabilities 703   832     1,391  
Finance lease liabilities 349   905     544  
Other current liabilities 613   1,060     965  
Total current liabilities 8,950   16,055     15,908  
Deferred revenue 41,250   41,250     45,000  
Operating lease liabilities 648   724     860  
Finance lease liabilities 0   20     328  
Other long-term liabilities 169   318     926  
Total liabilities 51,017   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 278,573   277,629     271,594  
Accumulated deficit (324,619)   (305,579)     (245,102)  
Total stockholders' deficit (46,005) $ (36,662) (27,909) $ 360 $ 10,895 26,532 $ (142,670)
Total liabilities and stockholders' deficit $ 5,012   $ 30,458     $ 89,554