Annual report pursuant to Section 13 and 15(d)

Consolidated Statements of Comprehensive Income (Loss) (Parenthetical)

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Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Statement of Comprehensive Income [Abstract]      
Taxes on unrealized losses on marketable securities $ 0 $ 0 $ 0