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Commitments and Contingencies - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jul. 26, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]            
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          
Gain recognized   $ 17,174 $ 0 $ 17,174 $ 0  
Acquisition-related liabilities   1,000   1,000   $ 13,186
Acquisition-related liabilities, current   1,000   1,000    
Acquisition-related liabilities, noncurrent   $ 1,000   $ 1,000