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Additional Financial Statement Information (Tables)
12 Months Ended
Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Other Nonoperating Income (Expense)
The caption “Other” on the consolidated statements of operations consists of the following (in thousands):
 
Years ended December 31,
 
2017
 
2016
 
2015
Foreign exchange gain (loss)
$
(724
)
 
$
449

 
$
(2,146
)
Interest income
167

 
179

 
225

Other
1,337

 
(246
)
 
(161
)
 
$
780

 
$
382

 
$
(2,082
)
Schedule of Accrued Liabilities
Other accrued expenses consist of the following (in thousands):
 
December 31,
 
2017
 
2016
Customer advance payments
$
3,229

 
$
2,468

Accrued restructuring
254

 
1,333

Goods received, not yet invoiced
4,060

 
1,618

Accrued taxes, other than income taxes
1,680

 
1,379

Accrued commissions
1,694

 
1,460

Accrued professional fees
1,731

 
2,155

Other
3,304

 
2,872

 
$
15,952

 
$
13,285