Product warranty (Tables)
|12 Months Ended|
Dec. 31, 2017
|Schedule of Product Warranty Reserve||
Changes in the Company’s warranty reserve were as follows:
Tabular disclosure of the changes in the guarantor's aggregate product warranty liability, including the beginning balance of the aggregate product warranty liability, the aggregate reductions in that liability for payments made (in cash or in kind) under the warranty, the aggregate changes in the liability for accruals related to product warranties issued during the reporting period, the aggregate changes in the liability for accruals related to preexisting warranties (including adjustments related to changes in estimates), and the ending balance of the aggregate product warranty liability.
Reference 1: http://www.xbrl.org/2003/role/presentationRef