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Accounting pronouncements, Contract Balances (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Accounting pronouncements [Abstract]    
Revenue recognised $ 587  
Contract liabilities [Abstract]    
Customer pre-payments 92 $ 79
Deferred revenue, current 307 169
Deferred revenue, non-current 253 69
Total contract liabilities $ 652 $ 317