Quarterly report pursuant to Section 13 or 15(d)

Balance Sheet Detail - Accounts payable and accrued expenses (Details)

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Balance Sheet Detail - Accounts payable and accrued expenses (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Accounts payable and accrued expenses    
Trade accounts payable $ 56,695 $ 62,751
Accrued expenses 3,391 3,902
Accounts payable and accrued expenses $ 60,086 $ 66,653