Annual report pursuant to Section 13 and 15(d)

Income taxes - Components of Income Tax Expense (Benefit) (Details)

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Income taxes - Components of Income Tax Expense (Benefit) (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Dec. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Jun. 30, 2015
United States:        
Federal $ 33 $ 459 $ 752 $ 121
State and local (88) (8) 140 123
Total current tax expense (benefit) (55) 451 892 244
United States:        
Total income tax expense (benefit) $ (55) $ 451 $ 892 $ 244