Quarterly report pursuant to Section 13 or 15(d)

CONDENSED CONSOLIDATED STATEMENTS OF NET AND COMPREHENSIVE INCOME (Parenthetical)

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CONDENSED CONSOLIDATED STATEMENTS OF NET AND COMPREHENSIVE INCOME (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Income Statement [Abstract]        
Unrealized (losses) gains on marketable securities, tax $ (57) $ 111 $ (221) $ 176
Foreign currency translation gain (loss), tax $ 0 $ 0 $ 0 $ 0