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Consolidated Statements of Operations (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Statement [Abstract]      
Sales to related parties $ 0 $ 1,063 $ 1,275
Services from related parties $ 0 $ 311 $ 170