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Leases - Practical expedients (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Jan. 01, 2019
Lessee, Lease, Description [Line Items]    
Practical expedients - package true  
Operating lease assets $ 9,574  
Operating lease liabilities, net of current portion $ 9,903  
ASU 2016-02 | Adjustment    
Lessee, Lease, Description [Line Items]    
Operating lease assets   $ 9,957
Operating lease liabilities, net of current portion   $ 10,690