Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Summary of Balance of The Company's Warranty Reserve (Detail)

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Summary of Significant Accounting Policies - Summary of Balance of The Company's Warranty Reserve (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Product Warranty Liability [Line Items]        
Balance at beginning of year $ 568 $ 1,367 $ 564 $ 1,260
Additions to warranty reserve 155 338 395 820
Claims fulfilled (130) (315) (366) (690)
Balance at end of year $ 593 $ 1,390 $ 593 $ 1,390