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Accrued expenses and other current liabilities - Summary of Accrued Expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Payables and Accruals [Abstract]    
Accrued expenses $ 8,783 $ 9,422
Other current liabilities 1,834 1,894
Accrued compensation 1,983 3,998
Income taxes payable 71 625
Accrued expenses and other current liabilities $ 12,671 $ 15,939