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Inventories
6 Months Ended
Jun. 30, 2021
Inventory Disclosure [Abstract]  
Inventories Inventories
Inventories at the respective balance sheet dates consisted of the following:
(in thousands)
June 30, 2021December 31, 2020
Raw materials$24,493 $19,560 
Finished units7,8014,171 
Inventories$32,294 $23,731