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Inventories (Tables)
 9 Months Ended
Sep. 30, 2017
Inventory Disclosure [Abstract]  
Inventories
 
September 30,
2017
 
December 31, 2016
 
(in thousands)
Raw materials
$
57,652

 
$
43,438

Work in process
3,588

 
2,279

Finished goods
6,070

 
3,017

 
67,310

 
48,734

Less:  Allowance for excess and obsolete inventories
(1,193
)
 
(1,382
)
Total, net
$
66,117

 
$
47,352
Inventories (Allowance)
The related changes in the allowance for excess and obsolete inventories account are as follows:

  
Three months ended
 
Nine months ended
 
September 30,
2017
 
September 30,
2016
 
September 30,
2017
 
September 30,
2016
Allowance for excess and obsolete inventories:
(in thousands)
Balance, beginning of period
$
1,642

 
$
1,065

 
$
1,382

 
$
757

Provisions for excess and obsolete inventories
(206
)
 
112

 
54

 
420

Inventories written off
(243
)
 
—

 
(243
)
 
—

Balance, end of period
$
1,193

 
$
1,177

 
$
1,193

 
$
1,177