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Pay vs Performance Disclosure - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Pay vs Performance Disclosure [Table]      
Pay vs Performance [Table Text Block]
Year  Summary Compensation Table Total for PEO   Compensation Actually Paid to PEO   Average Summary Compensation Table Total for Non-PEO NEOs   Average Compensation Actually Paid to Non-PEO NEOs   Value of Initial Fixed $100 Investment Based On Total Shareholder Return   Net Income (Loss) (in thousands) 
2024  $1,461,964   $1,432,196   $776,612   $738,216   $35.99   $(60,896)
2023  $1,586,412   $1,061,255   $979,314   $714,214   $39.90   $(55,024)
2022  $2,350,885   $1,634,024   $1,395,112   $983,327   $86.64   $(60,828)
    
Named Executive Officers, Footnote [Text Block]

 

(1)The PEO and other NEOs for the indicated years were as follows:

 

Year   PEO   Non-PEO NEOs
2024   Diane R. Garrett, Ph.D.   Stanton K. Rideout, Rebecca Jennings, David B. Thomas
2023   Diane R. Garrett, Ph.D.   Stanton K. Rideout
2022   Diane R. Garrett, Ph.D.   Stanton K. Rideout
    
PEO Total Compensation Amount $ 1,461,964 $ 1,586,412 $ 2,350,885
PEO Actually Paid Compensation Amount $ 1,432,196 1,061,255 1,634,024
Adjustment To PEO Compensation, Footnote [Text Block]

 

Reconciliation of Summary Compensation Table Total to Compensation Actually Paid for PEO

 

Year  2024   2023   2022 
Summary Compensation Table Total  $1,461,964    1,586,412    2,350,885 
(Minus): Grant Date Fair Value of Equity Awards Granted in Fiscal Year  $(200,400)   (500,900)   (1,200,000)
(Minus): Change in Pension Value  $0    0      
Plus: Pension Service Cost and Associated Prior Service Cost  $0    0      
Plus: Fair Value at Fiscal Year End of Outstanding and Unvested Equity Awards Granted in the Fiscal Year  $132,600    245,000    446,517 
Plus/(Minus): Change in Fair Value of Outstanding and Unvested Equity Awards Granted in Prior Fiscal Years  $(22,848)   (204,105)   (17,263)
Plus: Fair Value at Vesting of Equity Awards Granted and Vested in the Fiscal Year  $0    0    0 
Plus/(Minus): Change in Fair Value as of the Vesting Date of Equity Awards Granted in Prior Fiscal Years that Vested in the Fiscal Year  $60,880    (65,152)   53,886 
(Minus): Fair Value as of the Prior Fiscal Year End of Equity Awards Granted in Prior Fiscal Years that Failed to Meet Vesting Conditions in the Fiscal Year  $0    0    0 
Plus: Value of Dividends or Other Earnings Paid on Equity Awards Not Otherwise Reflected in Total Compensation  $0    0    0 
Compensation Actually Paid  $1,432,196    1,061,255    1,634,024 
    
Non-PEO NEO Average Total Compensation Amount $ 776,612 979,314 1,395,112
Non-PEO NEO Average Compensation Actually Paid Amount $ 738,216 714,214 983,327
Adjustment to Non-PEO NEO Compensation Footnote [Text Block]

Reconciliation of Summary Compensation Table Total to Compensation Actually Paid for Non-PEO NEOs

 

Year  2024   2023   2022 
Summary Compensation Table Total  $776,612    979,314    1,395,112 
(Minus): Grant Date Fair Value of Equity Awards Granted in Fiscal Year  $(144,733)   (250,450)   (637,500)
(Minus): Change in Pension Value  $0    0    0 
Plus: Pension Service Cost and Associated Prior Service Cost  $0    0    0 
Plus: Fair Value at Fiscal Year End of Outstanding and Unvested Equity Awards Granted in the Fiscal Year  $95,767    122,500    237,210 
Plus/(Minus): Change in Fair Value of Outstanding and Unvested Equity Awards Granted in Prior Fiscal Years  $(10,134)   (102,934)   (7,541)
Plus: Fair Value at Vesting of Equity Awards Granted and Vested in the Fiscal Year  $0    0    0 
Plus/(Minus): Change in Fair Value as of the Vesting Date of Equity Awards Granted in Prior Fiscal Years that Vested in the Fiscal Year  $20,705    (34,216)   (3,954)
(Minus): Fair Value as of the Prior Fiscal Year End of Equity Awards Granted in Prior Fiscal Years that Failed to Meet Vesting Conditions in the Fiscal Year  $0    0    0 
Plus: Value of Dividends or Other Earnings Paid on Equity Awards Not Otherwise Reflected in Total Compensation  $0    0    0 
Compensation Actually Paid  $738,216    714,214    983,327 
    
Compensation Actually Paid vs. Total Shareholder Return [Text Block]

 

    
Compensation Actually Paid vs. Net Income [Text Block]

   
Total Shareholder Return Amount $ 35.99 39.90 86.64
Net Income (Loss) Attributable to Parent $ (60,896,000) $ (55,024,000) $ (60,828,000)
PEO Name Diane R. Garrett Diane R. Garrett Diane R. Garrett
PEO [Member] | Grant Date Fair Value of Equity Awards Granted in Fiscal Year [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount $ (200,400) $ (500,900) $ (1,200,000)
PEO [Member] | Change in Pension Value [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 0 0  
PEO [Member] | Pension Service Cost and Associated Prior Service Cost [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 0 0  
PEO [Member] | Fair Value at Fiscal Year End of Outstanding and Unvested Equity Awards Granted in the Fiscal Year [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 132,600 245,000 446,517
PEO [Member] | Change in Fair Value of Outstanding and Unvested Equity Awards Granted in Prior Fiscal Years [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount (22,848) (204,105) (17,263)
PEO [Member] | Fair Value at Vesting of Equity Awards Granted and Vested in the Fiscal Year [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 0 0 0
PEO [Member] | Change in Fair Value as of the Vesting Date of Equity Awards Granted in Prior Fiscal Years that Vested in the Fiscal Year [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 60,880 (65,152) 53,886
PEO [Member] | Fair Value as of the Prior Fiscal Year End of Equity Awards Granted in Prior Fiscal Years that Failed to Meet Vesting Conditions in the Fiscal Year [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 0 0 0
PEO [Member] | Value of Dividends or Other Earnings Paid on Equity Awards Not Otherwise Reflected in Total Compensation [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 0 0 0
Non-PEO NEO [Member] | Grant Date Fair Value of Equity Awards Granted in Fiscal Year [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount (144,733) (250,450) (637,500)
Non-PEO NEO [Member] | Change in Pension Value [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 0 0 0
Non-PEO NEO [Member] | Pension Service Cost and Associated Prior Service Cost [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 0 0 0
Non-PEO NEO [Member] | Fair Value at Fiscal Year End of Outstanding and Unvested Equity Awards Granted in the Fiscal Year [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 95,767 122,500 237,210
Non-PEO NEO [Member] | Change in Fair Value of Outstanding and Unvested Equity Awards Granted in Prior Fiscal Years [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount (10,134) (102,934) (7,541)
Non-PEO NEO [Member] | Fair Value at Vesting of Equity Awards Granted and Vested in the Fiscal Year [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 0 0 0
Non-PEO NEO [Member] | Change in Fair Value as of the Vesting Date of Equity Awards Granted in Prior Fiscal Years that Vested in the Fiscal Year [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 20,705 (34,216) (3,954)
Non-PEO NEO [Member] | Fair Value as of the Prior Fiscal Year End of Equity Awards Granted in Prior Fiscal Years that Failed to Meet Vesting Conditions in the Fiscal Year [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 0 0 0
Non-PEO NEO [Member] | Value of Dividends or Other Earnings Paid on Equity Awards Not Otherwise Reflected in Total Compensation [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount $ 0 $ 0 $ 0