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Contingently Issuable Common Stock (Tables)
 12 Months Ended
Dec. 31, 2017
Business Combinations [Abstract]  
Schedule of Adjustments to the Fair Value of Contingent Payment

Fair Value of Contingently Issuable Common Stock
December 31, 2016
$
12,200

Fair value adjustment of Contingent Payment for year ended December 31, 2017
(2,900
)
December 31, 2017
$
9,300