Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2020

Fair Value Disclosures [Abstract]

Summary of Cash and Cash Equivalents, Money Market Funds and Short-term Investments by Significant Investment Category

The following tables show the Company’s cash and cash equivalents, Money Market Funds and short-term investments by significant investment category as of September 30, 2020 and December 31, 2019 (in thousands):

	As of September 30, 2020
	Adjusted Cost		Unrealized Gains		Unrealized Losses			Market Value
Level 1:
Money Market Funds	$	20,292	$	—	$	—		$	20,292
Level 2:
U.S. Treasury securities included in short-term    investments		101,106		5		—			101,111
U.S. government agency securities included in cash    and cash equivalents and short-term investments		66,998		6		(2	)		67,002
Corporate debt securities included in cash    and cash equivalents and short-term investments		85,338		0		(27	)		85,311
Total financial assets	$	273,734	$	11	$	(29	)	$	273,716

	As of December 31, 2019
	Adjusted Cost		Unrealized Gains		Unrealized Losses			Market Value
Level 1:
Money Market Funds	$	16,366	$	—	$	—		$	16,366
Level 2:
U.S. Treasury securities included in short-term    investments		2,998		—		—			2,998
U.S. government agency securities included in    short-term investments		34,204		1		(2	)		34,203
Total financial assets	$	53,568	$	1	$	(2	)	$	53,567