Product Warranty

12 Months Ended

Dec. 31, 2017

Product Warranty

Product Warranty

Note 8. Product Warranty

The Company generally offers a one year warranty for all of its systems, the terms and conditions of which vary depending upon the product sold. For all systems sold, the Company accrues a liability for the estimated cost of standard warranty at the time of system shipment and defers the portion of systems revenue attributable to the fair value of non‑standard warranty. Costs for non‑standard warranty are expensed as incurred. Factors that affect the Company’s warranty liability include the number of installed units, historical and anticipated product failure rates, material usage and service labor costs. The Company periodically assesses the adequacy of its recorded liability and adjusts the amount as necessary.

The changes in the Company’s product warranty liability are as follows:

	Year ended December 31,
	2017		2016		2015
	(in thousands)
Balance at January 1 (beginning of year)	$	2,666	$	3,555	$	1,526
Warranties issued during the period		5,671		3,125		4,305
Settlements made during the period		(2,603)		(4,249)		(2,672)
Changes in estimate of liability for pre-existing warranties during the period		(1,232)		235		396
Balance at December 31 (end of period)	$	4,502	$	2,666	$	3,555
Amount classified as current	$	4,112	$	2,426	$	3,363
Amount classified as long-term		390		240		192
Total warranty liability	$	4,502	$	2,666	$	3,555