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Revenue - Contract Balances (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2023
Dec. 31, 2022
Revenue      
Contract liabilities $ 563,000 $ 563,000 $ 338,000
Revenue recognized, included in contract balances $ 1,000 $ 278,000