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Stock Based Compensation - Stock Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Number of Shares Available for Issuance Under the Plan    
Beginning balance (in shares) 2,152,407  
Additional shares authorized (in shares) 903,395  
Granted (in shares) (300,743)  
Cancelled/Forfeited/Expired (in shares) 418,532  
Ending balance (in shares) 3,173,591 2,152,407
Number of Shares Outstanding Under the Plan    
Beginning balance (in shares) 701,833  
Granted (in shares) 0  
Exercised/Vested (in shares) (552)  
Cancelled/Forfeited/Expired (in shares) (4,308)  
Ending balance (in shares) 696,973 701,833
Exercisable (in shares) 95,745 98,469
Unvested (in shares) 601,228 603,364
Weighted- Average Exercise Price    
Beginning balance (in dollars per share) $ 303.73  
Granted (in dollars per share) 0  
Exercised/Vested (in dollars per share) 3.07  
Cancelled/Forfeited/Expired (in dollars per share) 15.32  
Ending balance (in dollars per share) 305.75 $ 303.73
Exercisable (in dollars per share) 9.60 9.52
Unvested (in dollars per share) $ 352.92 $ 351.75
Weighted-Average Remaining Contractual Term and Aggregate Intrinsic Value    
Options outstanding, weighted-average remaining contractual term 6 years 8 months 15 days 6 years 11 months 12 days
Exercisable, weighted-average remaining contractual term 4 years 3 months 18 days 4 years 6 months 21 days
Unvested, weighted-average remaining contractual term 6 years 8 months 15 days 6 years 11 months 12 days
Options outstanding, aggregate intrinsic value $ 94 $ 91
Exercisable, aggregate intrinsic value 93 90
Unvested, aggregate intrinsic value $ 1 $ 1
Restricted stock units    
Number of Plan shares outstanding    
Beginning balance (in shares) 2,497,773  
Granted (in shares) 300,743  
Exercised/Vested (in shares) (63,805)  
Cancelled/Forfeited/Expired (in shares) (414,224)  
Ending balance (in shares) 2,320,487 2,497,773
Weighted-Average Grant Date Fair Value per share    
Beginning balance (in dollars per share) $ 14.93  
Granted (in dollars per share) 6.36  
Exercised/Vested (in dollars per share) 27.53  
Cancelled/Forfeited/Expired (in dollars per share) 18.25  
Ending balance (in dollars per share) $ 12.88 $ 14.93