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Commitments and Contingencies - Contingent Acquisition Obligations (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2017
Sep. 30, 2019
Sep. 30, 2018
Contingent Acquisition Obligations      
Beginning fair value   $ 16,577  
Foreign currency translation adjustment   (147)  
Changes in fair value for contingent earnout obligations   148  
Ending fair value   16,578  
Mr. Chopra, Chief Executive Officer | Deferred bonus      
Indemnifications and Certain Employment-Related Contingencies      
Bonus payment on or within 45 days of January 1, 2024 contingent upon continued employment through that date $ 13,500    
Maximum number of days after January 1, 2024, bonus payment due 45 days    
CXR Limited      
Contingent Acquisition Obligations      
Remaining maximum amount of contingent consideration   26,800  
Payments for contingent consideration   $ 100 $ 200