Accumulated Other Comprehensive Income (Loss) (Tables)

12 Months Ended

Dec. 31, 2017

Equity [Abstract]

Schedule of Accumulated Other Comprehensive Income Loss

The following table shows a summary of changes in accumulated other comprehensive income (loss) by component from December 31, 2015 to December 31, 2017 (in thousands):

	Foreign Currency Translation			Unrealized Gains(Losses) on Available- for-Sale Marketable Securities			Total
Balance as of December 31, 2015	$	(52,261	)	$	(127	)	$	(52,388	)
Other comprehensive income (loss) before reclassifications		(76,410	)		104			(76,306	)
Amounts reclassified from accumulated other comprehensive    income (loss)		—			—			—
Net other comprehensive income (loss)		(76,410	)		104			(76,306	)
Balance as of December 31, 2016	$	(128,671	)	$	(23	)	$	(128,694	)
Other comprehensive income (loss) before reclassifications		35,352			(155	)		35,197
Amounts reclassified from accumulated other comprehensive    income (loss)		—			—			—
Net other comprehensive income (loss)		35,352			(155	)		35,197
Balance as of December 31, 2017	$	(93,319	)	$	(178	)	$	(93,497	)