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Commitments and contingencies (Tables)
12 Months Ended
Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Future Minimum Lease Payments under Operating Leases
Future minimum lease payments under the operating leases are as follows (in thousands):
Year ending December 31,
 

2019
$
5,375

2020
5,210

2021
3,876

2022
2,832

2023
2,858

Thereafter
7,167

Total
$
27,318