Fair Value of Financial Assets and Liabilities (Tables)

6 Months Ended

Jun. 30, 2017

Fair Value Disclosures [Abstract]

Schedule of Assets Measured at Fair Value on Recurring Basis

The following tables present information about the Company’s assets that are measured at fair value on a recurring basis as of June 30, 2017 and December 31, 2016 and indicate the level of the fair value hierarchy utilized to determine such fair value:

	Fair Value Measurements as of June 30, 2017 Using:
(In thousands)	Level 1		Level 2		Level 3		Total
Assets:
Cash equivalents	$	—	$	168,473	$	—	$	168,473
Marketable securities		—		162,680		—		162,680
	$	—	$	331,153	$	—	$	331,153

	Fair Value Measurements as of December 31, 2016 Using:
(In thousands)	Level 1		Level 2		Level 3		Total
Assets:
Cash equivalents	$	—	$	9,830	$	—	$	9,830
Marketable securities		—		179,414		—		179,414
	$	—	$	189,244	$	—	$	189,244