Annual report pursuant to Section 13 and 15(d)

Intangible assets, net - Amortization Expense (Details)

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Intangible assets, net - Amortization Expense (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Dec. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Jun. 30, 2015
Intangible assets, net        
Amortization expense $ 69 $ 391 $ 160 $ 30