v3.25.2
Consolidated Statement of Convertible Preferred Stock and Stockholders' Equity (Deficit) (unaudited) - USD ($)
Preferred Stock
Common Stock
Additional Paid in Capital
Accumulated deficit
Accumulated other comprehensive (loss) income
Total
Increase (Decrease) in Redeemable Convertible Preferred Stock            
Issuance of stock in connection with the asset acquisition of Trawsfynydd           $ 93,232,000
Issuance of stock in connection with the asset acquisition of Trawsfynydd (in shares)           10,359
Transaction costs paid through the issuance of stock           $ 4,815,000
Transaction costs paid through the issuance of stock (in shares)           535
Issuance of stock in connection with the private placement, net of expenses           $ 13,572,000
Issuance of stock in connection with the private placement, net of expenses (in shares)           1,578
Ending balance at Jun. 30, 2024           $ 111,619,000
Ending balance (in shares) at Jun. 30, 2024           12,472
Balance at Dec. 31, 2023   $ 9,000 $ 493,317,000 $ (482,631,000) $ (23,000) $ 10,672,000
Balance (in shares) at Dec. 31, 2023   840,251        
Increase (Decrease) in Stockholders' Equity (Deficit)            
Stock-based compensation     713,000     713,000
Stock issued for vested restricted stock units (in shares)   3,522        
Issuance of common stock, net of offering costs     427,000     427,000
Issuance of common stock, net of offering costs (in shares)   19,879        
Issuance of stock in connection with the asset acquisition of Trawsfynydd   $ 1,000 3,549,000     3,550,000
Issuance of stock in connection with the asset acquisition of Trawsfynydd (in shares)   141,982        
Transaction costs paid through the issuance of stock     169,000     169,000
Transaction costs paid through the issuance of stock (in shares)   6,747        
Exchange of Trawsfynydd stock options for options of the Company     7,085,000     7,085,000
Other comprehensive income         (10,000) (10,000)
Net (loss) income       (128,126,000)   (128,126,000)
Balance at Jun. 30, 2024   $ 10,000 505,260,000 (610,757,000) (33,000) (105,520,000)
Balance (in shares) at Jun. 30, 2024   1,012,381        
Increase (Decrease) in Redeemable Convertible Preferred Stock            
Issuance of stock in connection with the asset acquisition of Trawsfynydd           $ 93,232,000
Issuance of stock in connection with the asset acquisition of Trawsfynydd (in shares)           10,359
Transaction costs paid through the issuance of stock           $ 4,815,000
Transaction costs paid through the issuance of stock (in shares)           535
Issuance of stock in connection with the private placement, net of expenses           $ 13,572,000
Issuance of stock in connection with the private placement, net of expenses (in shares)           1,578
Ending balance at Jun. 30, 2024           $ 111,619,000
Ending balance (in shares) at Jun. 30, 2024           12,472
Balance at Mar. 31, 2024   $ 9,000 493,650,000 (487,614,000) (30,000) $ 6,015,000
Balance (in shares) at Mar. 31, 2024   843,553        
Increase (Decrease) in Stockholders' Equity (Deficit)            
Stock-based compensation     380,000     380,000
Stock issued for vested restricted stock units (in shares)   220        
Issuance of common stock, net of offering costs     427,000     427,000
Issuance of common stock, net of offering costs (in shares)   19,879        
Issuance of stock in connection with the asset acquisition of Trawsfynydd   $ 1,000 3,549,000     3,550,000
Issuance of stock in connection with the asset acquisition of Trawsfynydd (in shares)   141,982        
Transaction costs paid through the issuance of stock     169,000     169,000
Transaction costs paid through the issuance of stock (in shares)   6,747        
Exchange of Trawsfynydd stock options for options of the Company     7,085,000     7,085,000
Other comprehensive income         (3,000) (3,000)
Net (loss) income       (123,143,000)   (123,143,000)
Balance at Jun. 30, 2024   $ 10,000 505,260,000 (610,757,000) (33,000) (105,520,000)
Balance (in shares) at Jun. 30, 2024   1,012,381        
Balance at Dec. 31, 2024   $ 36,000 617,530,000 (649,154,000) (42,000) (31,630,000)
Balance (in shares) at Dec. 31, 2024 7,398 3,650,731        
Increase (Decrease) in Stockholders' Equity (Deficit)            
Stock-based compensation     266,000     266,000
Stock issued for vested restricted stock units (in shares)   6,509        
Issuance of common stock, net of offering costs   $ 16,000 3,141,000     3,157,000
Issuance of common stock, net of offering costs (in shares)   1,565,047        
Reclassification of warrant liability upon exercise of prefunded warrants and amended warrant agreements     15,827,000     15,827,000
Exercise of prefunded warrants   $ 16,000       16,000
Exercise of prefunded warrants (in shares)   1,582,559        
Conversion of Series C Preferred shares   $ 3,000 (3,000)      
Conversion of Series C Preferred shares (in shares) (661) 264,302        
Other comprehensive income         51,000 51,000
Net (loss) income       20,575,000   20,575,000
Balance at Jun. 30, 2025   $ 71,000 636,761,000 (628,579,000) 9,000 8,262,000
Balance (in shares) at Jun. 30, 2025 6,737 7,069,148        
Balance at Mar. 31, 2025   $ 50,000 633,633,000 (627,664,000) (19,000) 6,000,000
Balance (in shares) at Mar. 31, 2025 7,398 5,076,598        
Increase (Decrease) in Stockholders' Equity (Deficit)            
Stock-based compensation     105,000     105,000
Stock issued for vested restricted stock units (in shares)   5,301        
Issuance of common stock, net of offering costs   $ 16,000 3,026,000     3,042,000
Issuance of common stock, net of offering costs (in shares)   1,522,947        
Exercise of prefunded warrants   $ 2,000       2,000
Exercise of prefunded warrants (in shares)   200,000        
Conversion of Series C Preferred shares   $ 3,000 (3,000)      
Conversion of Series C Preferred shares (in shares) (661) 264,302        
Other comprehensive income         28,000 28,000
Net (loss) income       (915,000)   (915,000)
Balance at Jun. 30, 2025   $ 71,000 $ 636,761,000 $ (628,579,000) $ 9,000 $ 8,262,000
Balance (in shares) at Jun. 30, 2025 6,737 7,069,148