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Consolidated Statements of Changes in Equity (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Placement of shares      
Statement Line Items [Line Items]      
Net of issuance costs $ 187 $ 422 $ 286
Public offering      
Statement Line Items [Line Items]      
Net of issuance costs $ 840