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Related Parties
12 Months Ended
Dec. 31, 2019
Related Party Transactions [Abstract]  
Related Parties Related Parties
The Company purchases some supplies from an entity controlled by the Company’s CEO. The Company sometimes makes sales to the CEO for parts. Additionally, the Company sells units to an entity owned by a member of the President's immediate family. This entity is also one of the Company’s Representatives and as such, the Company makes payments to the entity for third party products.

Following is a summary of transactions and balances with affiliates:
Years Ended December 31,
201920182017
(in thousands)
Sales to affiliates$886  $1,442  $1,579  
Payments to affiliates332  342  432  
December 31,  
20192018
(in thousands)
Due from affiliates$22  $79  
Due to affiliates —