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Inventories
 12 Months Ended
Dec. 31, 2015
Inventory Disclosure [Abstract]  
Inventories
Inventories

The components of inventories and the related changes in the allowance for excess and obsolete inventories are as follows:
 
 
December 31,
 
2015
 
2014
 
(in thousands)
Raw materials
$
33,853

 
$
34,153

Work in process
2,522

 
2,262

Finished goods
2,881

 
1,917

 
39,256

 
38,332

Less:  Allowance for excess and obsolete inventories
(757
)
 
(714
)
Total, net
$
38,499

 
$
37,618


  
 
Years Ending December 31,
 
2015
 
2014
 
2013
Allowance for excess and obsolete inventories:
(in thousands)
Balance, beginning of period
$
714

 
$
579

 
$
363

Provisions for excess and obsolete inventories
178

 
135

 
243

Inventories written off
(135
)
 
—

 
(27
)
Balance, end of period
$
757

 
$
714

 
$
579