General form of registration statement for all companies including face-amount certificate companies

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) - Accrued Liabilities [Member] - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Product Warranty Liability [Line Items]            
Balance at beginning of year $ 538 $ 1,261 $ 564 $ 1,260 $ 1,260 $ 80
Additions to warranty reserve 366 250 633 482 821 2,415
Claims fulfilled (336) (144) (629) (375) (882) (1,235)
Change in estimate related to pre-existing warranties         (635) 0
Balance at end of year $ 568 $ 1,367 $ 568 $ 1,367 $ 564 $ 1,260