Marketable Securities (Tables)

9 Months Ended

Sep. 30, 2020

Investments, Debt and Equity Securities [Abstract]

Schedule of available-for-sale marketable securities and cash and cash equivalents

Available-for-sale marketable securities and cash and cash equivalents as of September 30, 2020 and December 31, 2019 consisted of the following (in thousands):

	September 30, 2020
	Amortized Cost Value		Gross  Unrealized  Gains		Gross  Unrealized  Losses		Fair Value
Cash and cash equivalents:
Cash	$	55,796	$	—	$	—	$	55,796
Money market funds	26,034		—		—		26,034
Total	$	81,830	$	—	$	—	$	81,830
Marketable securities:
Domestic corporate debt securities	$	38,822	$	91	$	(3)	$	38,910
Domestic corporate commercial paper	4,968		—		(5)		4,963
Total	$	43,790	$	91	$	(8)	$	43,873

	December 31, 2019
	Amortized Cost Value		Gross  Unrealized  Gains		Gross  Unrealized  Losses		Fair Value
Cash and cash equivalents:
Cash	$	34,726	$	—	$	—	$	34,726
Money market funds	35,160		—		—		35,160
Total	$	69,886	$	—	$	—	$	69,886
Marketable securities:
Domestic corporate debt securities	$	41,229	$	3	$	(3)	$	41,229
Domestic corporate commercial paper	24,900		5		—		24,905
Agency bonds	12,391		1		(3)		12,389
US treasury bonds	12,492		—		—		12,492
Total	$	91,012	$	9	$	(6)	$	91,015

Schedule of debt securities, available for sale, unrealized loss position

The following table summarizes such investments by major security type and length of time in a continuous unrealized loss position as of September 30, 2020 (in thousands).

	Less than 12 Months				12 months or longer		Total
	Fair value		Unrealized losses		Fair value	Unrealized losses	Fair value		Unrealized losses
Available-for-sale debt securities
Domestic corporate debt securities	$	4,621	$	(3)	—	—	$	4,621	$	(3)
Domestic corporate commercial paper	4,964		(5)		—	—	4,964		(5)
Total available-for-sale debt securities	$	9,585	$	(8)	—	—	$	9,585	$	(8)