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REVENUE RECOGNITION - Contract Balances (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Contract with Customer, Asset and Liability, Rollforward [Roll Forward]    
Balance at beginning of period $ 357 $ 185
Cash received from customers, excluding amounts recognized as revenue 83 777
Amounts recognized as revenue (357) (605)
Balance at end of period $ 83 $ 357