Fair Value Measurements and Fair Value of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2019

Fair Value Disclosures [Abstract]

Summary of Cash Equivalents and Short-term Investments

The following is a summary of the Company’s cash equivalents and short-term investments (in thousands):

	December 31, 2019
	Amortized Cost Basis			Unrealized Gains		Unrealized Loses			Estimated Fair Value
Level 1
Money market funds	$	15,056		$	—	$	—		$	15,056
Level 2
U.S. government and agency securities		37,974			14		(2	)		37,986
Commercial paper		87,983			8		(8	)		87,983
Corporate bonds		10,495			6		—			10,501
Total cash equivalents and short-term investments		151,508			28		(10	)		151,526
Less: Cash equivalents		(51,391	)		—		3			(51,388	)
Total short-term investments	$	100,117		$	28	$	(7	)	$	100,138

	December 31, 2018
	Amortized Cost Basis			Unrealized Gains		Unrealized Loses			Estimated Fair Value
Level 1
Money market funds	$	126		$	—	$	—		$	126
Level 2
U.S. government and agency securities		25,792			1		(4	)		25,789
Commercial paper		147,606			—		—			147,606
Corporate bonds		27,778			5		(17	)		27,766
Certificates of deposit		1,420			—		—			1,420
Total cash equivalents and short-term investments		202,722			6		(21	)		202,707
Less: Cash equivalents		(152,577	)		—		—			(152,577	)
Total short-term investments	$	50,145		$	6	$	(21	)	$	50,130