Cash, Cash Equivalents and Available for Sale Securities (Tables)

9 Months Ended

Sep. 30, 2021

Cash, Cash Equivalents, and Short-term Investments [Abstract]

Schedule of Available for Sale Securities

Available for sale securities, including carrying value and estimated fair values, are summarized as follows:

	As of September 30, 2021
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
U.S. Treasury securities	$	8,999	$	—	$	—	$	8,999
Corporate debt securities	43,614		—		(8)		43,606
Asset-backed securities	9,489		—		(3)		9,486
Total	$	62,102	$	—	$	(11)	$	62,091

	As of December 31, 2020
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
U.S. Treasury securities	$	54,225	$	8	$	—	$	54,233
Corporate debt securities	79,282		4		(10)		79,276
Asset-backed securities	10,164		1		—		10,165
Total	$	143,671	$	13	$	(10)	$	143,674

Schedule of Accumulated Other Comprehensive Income

The

changes in accumulated other comprehensive income associated with the unrealized gain on available for sale securities during the three and nine months ended September 30, 2021 and 2020, respectively, were as follows:

	Three months ended September 30,				Nine Months Ended September 30, 2021
	2021		2020		2021		2020
Beginning balance	$	3	$	—	$	3	$	—
Current period changes in fair value before reclassifications, net of tax	(14)		1		(14)		1
Amounts reclassified from accumulated other comprehensive income, net of tax	—		—		—		—
Total other comprehensive income (loss)	$	(14)	$	1	(14)		1
Ending balance	$	(11)	$	1	$	(11)	$	1