v3.25.1
Description of the Business (Details)
1 Months Ended 3 Months Ended
May 07, 2025
USD ($)
Dec. 11, 2024
Jun. 13, 2024
Feb. 28, 2024
Dec. 31, 2024
USD ($)
Jun. 30, 2021
USD ($)
Mar. 31, 2025
USD ($)
segment
Mar. 31, 2024
USD ($)
Feb. 25, 2025
USD ($)
Jun. 21, 2024
USD ($)
Mar. 07, 2024
USD ($)
Feb. 21, 2024
USD ($)
Dec. 03, 2021
USD ($)
Description of the Business [Line Items]                          
Number of reportable segments | segment             1            
Net loss             $ 12,461,000 $ 35,782,000          
Cash provided by operating activities             1,344,000 (13,299,000)          
Unrestricted cash and cash equivalents         $ 38,648,000   34,326,000 $ 44,457,000          
Accumulated deficit         621,864,000   634,535,000            
Unsecured Convertible Notes, Due 2026                          
Description of the Business [Line Items]                          
Aggregate principal amount                         $ 150,000,000.0
Convertible Debt                          
Description of the Business [Line Items]                          
Aggregate principal amount           $ 150,000,000.0              
Debt instrument, repurchase amount         120,000,000       $ 300,000 $ 300,000 $ 30,900,000 $ 30,900,000  
Principal outstanding         $ 30,000,000   $ 29,715,000            
Repurchase price as percentage of par plus accrued and unpaid interest           101.00%              
Net proceeds from future asset sales (as percent)   0.95 0.95 0.95 0.95                
Line of Credit | Subsequent Event | Secured Debt | Asset-Backed Term Loan                          
Description of the Business [Line Items]                          
Aggregate principal amount $ 40,000,000                        
Debt instrument term (in years) 3 years                        
CM Partners, LLC                          
Description of the Business [Line Items]                          
Membership interests acquired (as percent)                         100.00%