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Income taxes - Schedule of Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2020
Dec. 31, 2018
Dec. 31, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]        
Balance at beginning of year $ 571 $ 581 $ 764 $ 1,208
Increases for prior year tax positions 0 32 0 63
Increases for current year tax positions 10 90 173 68
Decreases for prior year tax positions 0 0 (8) (1)
Decreases due to settlements 0 (29) 0 (32)
Decreases due to statutes lapsing 0 (197) (358) (542)
Balance at end of year $ 581 $ 477 $ 571 $ 764