Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Significant Accounting Policies - Summary of Changes in Warranty Provision (Detail)

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Significant Accounting Policies - Summary of Changes in Warranty Provision (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Accounting Policies [Abstract]    
Balance at beginning of the year $ 61  
Warranty Provision 198 $ 118
Warranty Claims Settled (232) (57)
Balance at end of the year $ 27 $ 61