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Warranty Reserve - Summary of Warranty Reserve Activity Included in Accounts Payable and Accrued Liabilities within the consolidated balance sheets (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Guarantees [Abstract]    
Balance at beginning of period $ 195 $ 258
Additions 18 16
Releases and/or charges incurred (27) (47)
Balance at end of period $ 186 $ 227