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Guarantees
9 Months Ended
Sep. 30, 2021
Guarantees [Abstract]  
Guarantees GuaranteesWe provide warranties on certain of our products at the time of sale and sell extended warranties. The standard warranty period for our capital equipment is generally one year and our extended warranties typically vary from one to three years. Liability under warranty policies is based upon a review of historical claim experience. Adjustments are made to accruals as claim data and historical experience warrant.
Changes in the liability for standard warranties for the nine months ended September 30, are as follows:

 20212020
Balance as of January 1,$1,826 $2,186 
Provision for warranties1,235 616 
Claims made(683)(932)
Balance as of September 30,$2,378 $1,870 
 
Costs associated with extended warranty repairs are recorded as incurred and amounted to $5.2 million and $4.4 million for the nine months ended September 30, 2021 and 2020, respectively.