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Commitments and contingencies - Future annual minimum lease payment commitments (Details)
$ in Thousands
Mar. 31, 2020
USD ($)
Future annual minimum lease payment commitments:  
2020 $ 2,062
2021 2,901
2022 2,493
2023 2,568
2024 2,645
2025 2,725
Thereafter 12,770
Total $ 28,164