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Inventories, net (Tables)
12 Months Ended
Dec. 31, 2020
Inventories, net  
Summary of Inventories, net

December 31, 

    

2020

    

2019

(in thousands)

Component parts

$

5,439

$

7,429

Work-in-process and finished goods

 

7,654

 

12,390

Total

$

13,093

$

19,819