Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2019

Fair Value Disclosures [Abstract]

Cash Equivalents and Marketable Securities Measured at Fair Value on a Recurring Basis

The following table summarizes our cash equivalents and marketable securities measured at fair value on a recurring basis as of September 30, 2019 (in thousands):

	Level 1		Level 2		Level 3		Total
Cash equivalents	$	14,172	$	21,444	$	—	$	35,616
Marketable securities:
U.S. Treasuries	—		161,071		—		161,071
Government securities	—		79,646		—		79,646
Corporate debt securities	—		218,050		—		218,050
Total cash equivalents and marketable securities	$	14,172	$	480,211	$	—	$	494,383