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Disaggregation of Revenue - Contract balances (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Assets    
Trade receivables, net $ 9,999 $ 140,000
Liabilities    
Contracted liabilities - long term 461,000 351,000
Contract liabilities    
Opening 351,000 235,000
Additions 450,000 116,000
Transfer to revenue (340,000)  
Ending $ 461,000 $ 351,000