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Commitments and contingencies
 6 Months Ended
Jun. 30, 2018
Commitments and Contingencies Disclosure [Abstract]  
Commitments and contingencies
Commitments and contingencies  
  
We offer a one-year limited warranty on most hardware products which is included in the terms of sale of such products. We also offer optional extended warranties on our hardware products for which the related revenue is recognized ratably over the warranty period. Provision is made for estimated future warranty costs at the time of the sale for the estimated costs that may be incurred under the standard warranty. Our estimate is based on historical experience and product sales during the period.  The warranty reserve for the six months ended June 30, 2018 and 2017 was as follows:


 
Six Months Ended June 30,
(In thousands)
 
(Unaudited)

 
2018
 
2017
Balance at the beginning of the period
 
$
2,846

 
$
2,686

Accruals for warranties issued during the period
 
1,456

 
1,288

Accruals related to pre-existing warranties
 
155

 
161

Settlements made (in cash or in kind) during the period
 
(1,459
)
 
(1,330
)
Balance at the end of the period
 
$
2,998

 
$
2,805


  
As of June 30, 2018, we had non-cancelable purchase commitments with various suppliers of customized inventory and inventory components totaling approximately $7.8 million over the next twelve months.  

As of June 30, 2018, we had outstanding guarantees for payment of customs and foreign grants totaling approximately $2.1 million, which are generally payable over the next twelve months.