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Short-term Investments (Tables)

3 Months Ended

Mar. 31, 2021

Investments, Debt and Equity Securities [Abstract]

Schedule of cash equivalents and short-term investments measured at fair value

The following table summarizes, by major security type, our cash equivalents and short-term investments that are measured at fair value on a recurring basis (in thousands) as of March 31, 2021:


	Amortized Cost		Unrealized Gains		Unrealized Losses		Fair Value		Cash equivalents		Short-term Investments
	(unaudited)
Money market funds	$	125,378	$	—	$	—	$	125,378	$	125,378	$	—
U.S. Treasury notes	49,123		7		—		49,130		—		49,130
Commercial paper	57,067		—		—		57,067		—		57,067
Corporate bonds	27,615		—		(5)		27,610		—		27,610

Total	$	259,183	$	7	$	(5)	$	259,185	$	125,378	$	133,807

The following table summarizes, by major security type, our cash equivalents and short-term investments that are measured at fair value on a recurring basis (in thousands) as of December 31, 2020:


	Amortized Cost		Unrealized Gains		Unrealized Losses		Fair Value		Cash equivalents		Short-term Investments
Money market funds	$	79,387	$	—	$	—	$	79,387	$	79,387	$	—
US treasury notes	59,382		7		—		59,389		—		59,389
Commercial paper	68,018		—		—		68,018		—		68,018
Corporate bonds	48,494		8		(1)		48,501		—		48,501
Asset-backed securities	3,009		—		—		3,009		—		3,009
Total	$	258,290	$	15	$	(1)	$	258,304	$	79,387	$	178,917