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

3. Inventories

Inventories consist of the following (in thousands):

 

 

 

September 30,

2018

 

 

December 31,

2017

 

Raw materials and purchased parts

 

$

2,778

 

 

$

1,471

 

Work in progress

 

 

3,303

 

 

 

1,877

 

Finished goods

 

 

19,150

 

 

 

13,213

 

Total inventories

 

$

25,231

 

 

$

16,561