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Income taxes - Schedule of Components of (Provision) Benefit for Income Taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Current:      
U.S. federal $ (2,414) $ (2,058) $ (9,978)
State (948) (369) (2,096)
Foreign (8) 0 0
Total current (3,370) (2,427) (12,074)
Deferred:      
U.S. federal 1,005 13,246 8,384
State 101 (21) (773)
Foreign (167) 208 (36)
Total deferred 939 13,433 7,575
Total (provision) benefit for income taxes $ (2,431) $ 11,006 $ (4,499)