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Income taxes (Tables)
12 Months Ended
Dec. 31, 2021
Income Tax Disclosure [Abstract]  
Schedule of deferred tax assets and liabilities
   2021   2020 
Deferred tax assets:        
Net operating loss carry-forwards  $13,780   $16,281 
Accruals and reserves   333    366 
Deferred revenue   57    60 
Intangibles   130    188 
Other, net   198    228 
Fixed assets   
-
    
-
 
Gross tax assets   14,498    17,123 
Valuation allowance   (14,498)   (17,123)
Realizable deferred tax asset   
-
    
-
 

 

Schedule of net deferred tax assets and liabilities
   2021   2020 
Income tax benefit at the federal statutory rate  $(102)  $(142)
State income tax benefit   (33)   (47)
NOL expiration   2,703    
-
 
Prior year true-ups   49    (79)
Permanent items and other   
-
    4 
Tax cuts and Jobs Act Rate Change   9    
-
 
Change in valuation allowance   (2,625)   265 
Income tax expense  $1   $1