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Inventories, net (Tables)
12 Months Ended
Dec. 31, 2021
Inventories, net  
Summary of Inventories, net

    

2021

    

2020

(in thousands)

Component parts

$

3,841

$

5,439

Work-in-process and finished goods

 

6,504

 

7,654

Total

$

10,345

$

13,093