Annual report pursuant to Section 13 and 15(d)

Changes in Initial Product Warranty Accrual and Expenses Under Initial and Extended Warranties (Detail)

v3.21.1
Changes in Initial Product Warranty Accrual and Expenses Under Initial and Extended Warranties (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Movement in Standard Product Warranty Accrual      
Balance, January 1 $ 1,110 $ 1,308 $ 1,190
Provision for estimated warranty cost 1,047 806 901
Warranty expenditures (1,025) (1,004) (783)
Balance, December 31 1,132 1,110 1,308
Less: long-term portion of warranty accrual 384 245 447
Current portion of warranty accrual $ 748 $ 865 $ 861