XML 72 R59.htm IDEA: XBRL DOCUMENT v3.19.1
Revenue Recognition (Schedule of Contract Assets and Liabilities) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Opening [Member]    
Contract Receivables and Liabilities [Line Items]    
Receivables $ 305 $ 266
Contract Liability 219 235
Closing [Member]    
Contract Receivables and Liabilities [Line Items]    
Receivables 320 286
Contract Liability 214 212
Increase/(Decrease) [Member]    
Contract Receivables and Liabilities [Line Items]    
Receivables 15 20
Contract Liability $ (5) $ (23)