Guarantees

We provide warranties on certain of our products at the time of sale and sell extended warranties. The standard warranty period for our capital and reusable equipment is generally one year and our extended warranties can vary in length. Liability under service and warranty policies is based upon a review of historical warranty and service claim experience. Adjustments are made to accruals as claim data and historical experience warrant.

Changes in the carrying amount of service and product standard warranties for the three months ended March 31, are as follows:



	2018			2017
Balance as of January 1,	$	1,750		$	1,954

Provision for warranties	323			150

Claims made	(290		)	(279		)

Balance as of March 31,	$	1,783		$	1,825

Costs associated with extended warranty repairs are recorded as incurred and amounted to $1.3 million and $1.1 million for the three months ended March 31, 2018 and 2017, respectively.