Fair Value of Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2019

Fair Value Disclosures [Abstract]

Summary of Fair Values of Financial Instruments

The fair values of the Company’s financial instruments are presented below (in thousands):

			Fair Value Measurements at June 30, 2019
	Total		Level 1		Level 2		Level 3
Financial assets carried at fair value:
Cash equivalents:
Government money market funds	$	12,870	$	12,870	$	—	$	—
Corporate debt securities, available-for-sale		4,557		—		4,557		—
Short-term investments
Certificate of deposit		251		—		251		—
Corporate debt securities, available-for-sale		273,262		—		273,262		—
Total financial assets	$	290,940	$	12,870	$	278,070	$	—

			Fair Value Measurements at December 31, 2018
	Total		Level 1		Level 2		Level 3
Financial assets carried at fair value:
Cash equivalents:
Government money market funds	$	1,724	$	1,724	$	—	$	—
Corporate debt securities, available-for-sale		21,976		—		21,976		—
Short-term investments
Commercial paper, available for sale		3,479		—		3,479		—
Corporate debt securities, available-for-sale		273,262		—		273,262		—
Total financial assets	$	300,441	$	1,724	$	298,717	$	—