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Summary of significant accounting policies - Recent Accounting Pronouncements (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Recent Accounting Pronouncements      
Lease liabilities $ 56,193    
Retained earnings $ (1,541,763)   $ (1,877,759)
Capital lease obligations     18,696
Office Building in Morges, Switzerland | Building and leasehold improvements      
Recent Accounting Pronouncements      
Capital lease asset     18,700
Capital lease obligations     $ 18,700
ASU No. 2016-02 | Restatement Adjustment      
Recent Accounting Pronouncements      
Lease right-of-use assets   $ 23,600  
Lease liabilities   23,700  
Retained earnings   $ 100