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Related Parties - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Jun. 30, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Jan. 11, 2018
Dec. 31, 2017
Nov. 30, 2017
Subsidiary Of Fugro N.V. (AMS:FUR)                
Related Party Transaction [Line Items]                
Ownership percent               23.60%
Expenses for services   $ 3.0   $ 7.1        
GMH                
Related Party Transaction [Line Items]                
Management fees paid   0.1   0.5        
Affiliated Entity | Harbinger Capital Partners                
Related Party Transaction [Line Items]                
Expenses under service agreement   1.0 $ 1.2 2.9 $ 3.1      
Issuance Of Secured Convertible Notes | Life Sciences | Blossom Innovations, LLC | R2 Dermatology, Inc.                
Related Party Transaction [Line Items]                
Debt issued to related party   $ 1.0   $ 1.0     $ 1.5  
Letter of Credit | Affiliated Entity | Harbinger Capital Partners                
Related Party Transaction [Line Items]                
Expenses under service agreement $ 0.8              
Subsidiary Of Fugro N.V. (AMS:FUR) | GMSL                
Related Party Transaction [Line Items]                
Secured loan               $ 7.5
Interest rate (as a percent)   10.00%   10.00%   4.00%    
Interest expense on note   $ 0.2   $ 0.6