Cash, Cash Equivalents and Marketable Securities (Tables)

6 Months Ended

Jun. 30, 2020

Cash and Cash Equivalents [Abstract]

Amortized cost and fair value of cash, cash equivalents and marketable securities

The following tables summarize the amortized cost and the estimated fair value of our cash, cash equivalents and marketable securities as of June 30, 2020 and December 31, 2019 (in thousands):

	June 30, 2020
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Current assets:
Cash	$	23,688	$	—	$	—	$	23,688
Cash equivalents:
U.S. Treasuries	11,300		—		—		11,300
Money market funds	61,840		—		—		61,840
Certificate of deposits	10,900		—		—		10,900
Commercial paper	29,143		—		—		29,143
Total cash and cash equivalents	136,871		—		—		136,871
Marketable securities:
U.S. Treasuries	55,677		3		—		55,680
Commercial paper	94,567		—		—		94,567
U.S. Government-sponsored enterprises debt securities	6,200		13		—		6,213
Corporate debt securities	53,537		637		—		54,174
Certificate of deposits	42,744		—		—		42,744
Total marketable securities	252,725		653		—		253,378
Total cash, cash equivalents and marketable securities	$	389,596	$	653	$	—	$	390,249

	December 31, 2019
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Current assets:
Cash	$	43,058	$	—	$	—	$	43,058
Cash equivalents:
Money market funds	11,527		—		—		11,527
Commercial paper	7,485		—		—		7,485
Total cash and cash equivalents	62,070		—		—		62,070
Marketable securities:
Commercial paper	73,366		—		—		73,366
Corporate debt securities	74,038		381		(2)		74,417
Certificate of deposits	41,302		—		—		41,302
Total marketable securities	188,706		381		(2)		189,085
Total cash, cash equivalents and marketable securities	$	250,776	$	381	$	(2)	$	251,155

Cost and fair value of marketable securities

The following table summarizes the cost and fair value of marketable securities based on stated effective maturities as of June 30, 2020 (in thousands):

	Amortized Cost		Fair Value
Due within one year	$	245,025	$	245,635
Due between one and two years	7,700		7,743
Total	$	252,725	$	253,378