Annual report pursuant to Section 13 and 15(d)

Statements of Operations (Parenthetical)

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Statements of Operations (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Statement [Abstract]      
Revenue from related parties $ 22,536 $ 18,966 $ 44,606