Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2018

Fair Value Disclosures [Abstract]

Summary of Financial Assets Recognized at Fair Value on Recurring Basis

As of June 30, 2018 and December 31, 2017, the Company’s financial assets recognized at fair value on a recurring basis consisted of the following:

	Fair Value as of June 30, 2018
	Total		Level 1		Level 2		Level 3
	(In thousands)
Cash equivalents	$	300,332	$	300,332	$	—	$	—
Total	$	300,332	$	300,332	$	—	$	—

	Fair Value as of December 31, 2017
	Total		Level 1		Level 2		Level 3
	(In thousands)
Cash equivalents	$	330,896	$	330,896	$	—	$	—
Total	$	330,896	$	330,896	$	—	$	—