v3.26.1
Organization and Basis of Presentation - Additional Information (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2026
USD ($)
Jun. 30, 2025
USD ($)
Jun. 30, 2026
USD ($)
Segment
Jun. 30, 2025
USD ($)
Dec. 31, 2025
USD ($)
Debt Instrument [Line Items]          
Cash and cash equivalents $ 3,730,000 $ 3,562,000 $ 3,730,000 $ 3,562,000 $ 2,990,000
Investments 6,189,000   6,189,000   16,279,000
Restricted cash and cash equivalents and restricted short-term investments 500,000   500,000   10,300,000
Working capital 14,800,000   14,800,000    
Inventory Valuation Reserves 2,800,000   2,800,000    
Disposal of property and equipment     34,000 258,000  
Other long-term assets 7,015,000   7,015,000   7,828,000
Accumulated deficit 735,346,000   735,346,000   $ 719,620,000
Net cash used in operating activities     10,386,000 6,251,000  
Impairment of Intangible Assets (Excluding Goodwill) $ 0 $ 0 $ 0 $ 0  
Intangible Asset, Excluding Goodwill, Impairment Loss, Statement of Income or Comprehensive Income [Extensible Enumeration] Asset, Impairment Loss Asset, Impairment Loss Asset, Impairment Loss Asset, Impairment Loss  
Number of operating segments | Segment     1    
Number of reportable segments | Segment     1    
Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration]     srt:ChiefExecutiveOfficerMember    
Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherAssetsNoncurrent          
Debt Instrument [Line Items]          
Other long-term assets $ 1,800,000   $ 1,800,000