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Stock-Based Compensation - Stock option activities (Details) - $ / shares
 3 Months Ended 12 Months Ended 15 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Mar. 31, 2024
Number of Stock Options Outstanding          
Balances as of beginning 392        
Balances as of end 392 392     392
Weighted-Average Exercise Price          
Balances as of beginning (in dollars per share) $ 6.16        
Balances as of end (in dollars per share) $ 6.16 $ 6.16     $ 6.16
Stock Options          
Shares Available for Grant          
Balances as of beginning 605,826 2,641,679 1,679,763   2,641,679
Options granted   0 (105,000)   0
Cancelled   64,117 1,066,916    
Balances as of end   605,826 2,641,679 1,679,763  
Number of Stock Options Outstanding          
Balances as of beginning 3,579,294 4,773,892 8,194,822   4,773,892
Granted   0 105,000   0
Exercised   (1,130,481) (2,459,014)    
Cancelled   (64,117) (1,066,916)    
Balances as of end 668,000 3,579,294 4,773,892 8,194,822 668,000
Vested as of end 667,000 3,311,859     667,000
Vested and expected to be vest as of end 634,000 3,569,024     634,000
Weighted-Average Exercise Price          
Balances as of beginning (in dollars per share) $ 0.02 $ 0.02 $ 0.02   $ 0.02
Granted (in dollars per share)     0.02    
Exercised (in dollars per share)   0.02 0.02    
Cancelled (in dollars per share)   0.02 0.02    
Balances as of end (in dollars per share) 0.11 0.02 $ 0.02 $ 0.02 0.11
Vested as of end (in dollars per share) 0.11 0.02     0.11
Vested and expected to be vest as of end (in dollars per share) $ 0.11 $ 0.02     $ 0.11
Weighted Average Remaining Contractual Life (Years)          
Options Outstanding Weighted Average Remaining Contractual Life 5 years 3 months 18 days 5 years 6 months 5 years 1 month 6 days 6 years 1 month 6 days  
Vested as of December 31, 2023 5 years 3 months 18 days 5 years 3 months 18 days      
Vested and expected to be vest as of December 31, 2023 5 years 1 month 6 days 5 years 6 months      
RSUs          
Shares Available for Grant          
RSUs granted   (2,099,970)      
Number of Stock Options Outstanding          
Balances as of beginning 2,100        
Balances as of end   2,100      
Weighted-Average Exercise Price          
Balances as of beginning (in dollars per share) $ 1.15        
Balances as of end (in dollars per share)   $ 1.15