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Summary of Warranty Accrual Account Activity (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Leases [Abstract]    
Balance at beginning of period $ 399 $ 456
New product warranties 9 5
Claims activity (22) (28)
Balance at end of period $ 386 $ 433