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Related Parties
 9 Months Ended
Sep. 30, 2019
Related Party Transactions [Abstract]  
Related Parties Related PartiesThe 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.  All related party transactions are made on standard Company terms.
The following is a summary of transactions and balance with affiliates:

 Three months endedNine months ended
 September 30,
2019		September 30,
2018		September 30,
2019		September 30,
2018
(in thousands)
Sales to affiliates$338  $298  $706  $890  
Payments to affiliates32  48  225  159  

 September 30,
2019		December 31, 2018
 (in thousands)
Due from affiliates$119  $79  
Due to affiliates—  —