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Inventories
9 Months Ended
Sep. 30, 2018
Inventory Disclosure [Abstract]  
Inventories

5.

Inventories

 

(Table only in thousands)

 

September 30, 2018

 

 

December 31, 2017

 

Raw materials

 

$

15,500

 

 

$

18,444

 

Work in process

 

 

7,520

 

 

 

3,182

 

Finished goods

 

 

787

 

 

 

940

 

Obsolescence allowance

 

 

(1,531

)

 

 

(1,597

)

Total inventories

 

$

22,276

 

 

$

20,969

 

 

Amounts credited to the allowance for obsolete inventory and charged to cost of sales amounted to $0.1 million and $0.5 million for the three-month periods ended September 30, 2018 and 2017, respectively, and $0.6 million and $0.8 million for the nine-month periods ended September 30, 2018 and 2017, respectively.