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Financial Guarantee Liability - Summary of Changes on Estimated Liability Under Guarantee Liability (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Guaranty LIability:    
Beginning Balance $ 32 $ 54
Reversal of provision (17) (22)
Ending Balance $ 15 $ 32