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Commitments and Contingencies - Narrative (Details) - USD ($)
$ in Thousands
Jul. 26, 2018
Jun. 30, 2018
Dec. 31, 2017
Loss Contingencies [Line Items]      
Acquisition-related liabilities   $ 21,099 $ 13,186
Subsequent Event      
Loss Contingencies [Line Items]      
Amount awarded to other party in settlement $ 1,000    
Issuance of common shares in litigation settlement (in shares) 500,000    
Additional amount to be awarded to other party in settlement, within 12 months $ 1,000    
Additional amount to be awarded to other party in settlement, within 24 months 1,000    
Acquisition-related liabilities $ 4,000