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Summary of Significant Accounting Policies - Accounts receivable (Details)
Jun. 30, 2022
USD ($)
customer
Dec. 31, 2021
USD ($)
Accounts receivable    
Accounts receivable $ 2,382,000 $ 752,000
Overdue accounts receivable $ 0  
Customer Concentration Risk    
Accounts receivable    
Number of customers | customer 3  
Accounts receivable $ 2,382,000 $ 752,000