Marketable Securities and Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2019

Fair Value Disclosures [Abstract]

Schedule of Marketable Securities

The following tables present details of the Company’s marketable securities as of September 30, 2019 and December 31, 2018 (in thousands):

	September 30, 2019
	Amortized Cost		Gross Unrealized Losses			Estimated Fair Value
Short-term:
Investment securities	$	6,055	$	(6	)	$	6,049
Total	$	6,055	$	(6	)	$	6,049

	December 31, 2018
	Amortized Cost		Gross Unrealized Losses			Estimated Fair Value
Short-term:
Investment securities	$	114,402	$	(124	)	$	114,278
Long-term:
Investment securities	6,603		(77		)	6,526
Total	$	121,005	$	(201	)	$	120,804

Schedule of the Fair Value of the Company's Financial Assets Measured at Fair Value on a Recurring Basis Based on the Three-Tier Value Hierarchy

The following tables set forth the fair value of the Company’s financial assets measured at fair value on a recurring basis as of September 30, 2019 and December 31, 2018 based on the three-tier value hierarchy (in thousands):

	September 30, 2019
	Level 1		Level 2		Level 3		Total
Cash equivalents:
Money market funds and other funds	$	1,214,845	$	—	$	—	$	1,214,845
Short-term investments:
Investment securities	—		6,049		—		6,049
Other non-current assets:
Certificate of deposit	5,076		—		—		5,076
Total	$	1,219,921	$	6,049	$	—	$	1,225,970

	December 31, 2018
	Level 1		Level 2		Level 3		Total
Cash equivalents:
Money market funds	$	715,086	$	—	$	—	$	715,086
Short-term investments:
Investment securities	—		114,278		—		114,278
Other non-current assets:
Certificate of deposit	5,000		—		—		5,000
Long-term:
Investment securities	—		6,526		—		6,526
Total	$	720,086	$	120,804	$	—	$	840,890