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Income taxes - Schedule of Components of (Provision) Benefit for Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2018
Current:          
U.S. federal $ (13)   $ (4,772) $ (2,681) $ (2,414)
State (139)   (1,186) (1,066) (948)
Foreign (22)   (84) 5 (8)
Total current (174)   (6,042) (3,742) (3,370)
Deferred:          
U.S. federal 3,096   7,159 (2,532) 1,005
State 368   1,293 99 101
Foreign (31)   132 (10) (167)
Total deferred 3,433   8,584 (2,443) 939
Total (provision) benefit for income taxes $ 3,259 $ (433) $ 2,542 $ (6,185) $ (2,431)