Annual report pursuant to Section 13 and 15(d)

Income Taxes - Narrative (Details)

v3.24.0.1
Income Taxes - Narrative (Details) - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Income Tax Examination [Line Items]    
Net loss from continuing operations $ (41,915,000) $ (45,421,000)
Net loss from discontinued operation (10,841,000) (5,469,000)
Net loss (52,785,000) (50,894,000)
Valuation allowance 65,375,000 59,057,000
Accrual for interest and penalties on unrecognized tax benefits 0 0
Interest and/or penalties expense on unrecognized tax benefits 0 0
Domestic Tax Authority    
Income Tax Examination [Line Items]    
Operating loss carryforwards 236,697,000  
Net operating losses subject to expiration 85,674,000  
Domestic Tax Authority | Research Tax Credit Carryforward    
Income Tax Examination [Line Items]    
Tax credit carryforward 2,286,000  
State and Local Jurisdiction    
Income Tax Examination [Line Items]    
Operating loss carryforwards 133,099,000  
Net operating losses not subject to expiration 151,023,000  
State and Local Jurisdiction | Research Tax Credit Carryforward    
Income Tax Examination [Line Items]    
Tax credit carryforward 1,622,000  
United States    
Income Tax Examination [Line Items]    
Net loss $ (51,662,000) $ (52,415,000)