v3.8.0.1
Income taxes (Components of Deferred Income Tax Assets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred income tax assets:    
Net operating loss carry-forward $ 3,512 $ 1,307
Less: Valuation allowance (3,512) (1,307)
Deferred income tax assets, net 0 0
Deferred Tax Liabilities, Net, Noncurrent 10,572 6,323
Leasehold improvements [Member]    
Deferred income tax assets:    
Deferred Tax Liabilities, Property, Plant and Equipment 7 0
Proprietary technology of BOCA [Member]    
Deferred income tax assets:    
Deferred Tax Liabilities, Intangible Assets 5,972 6,299
Backlog [Member]    
Deferred income tax assets:    
Deferred Tax Liabilities, Intangible Assets 0 24
Virtual reality technologies [Member]    
Deferred income tax assets:    
Deferred Tax Liabilities, Intangible Assets $ 4,593 $ 0