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Revenue - Contract Balances (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2023
Dec. 31, 2022
Revenue      
Contract liabilities $ 183,000 $ 183,000 $ 338,000
Revenue recognized, included in contract balances $ 3,000 $ 277,000