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Inventories, net (Tables)
6 Months Ended
Jun. 30, 2021
Inventories, net  
Summary of Inventories, net

June 30, 

December 31, 

    

2021

    

2020

(in thousands)

Component parts

$

4,815

$

5,439

Work-in-process and finished goods

 

4,683

 

7,654

Total

$

9,498

$

13,093