Cash and Cash Equivalents and Investments (Tables)

9 Months Ended

Sep. 30, 2021

Cash and Cash Equivalents and Investments [Abstract]

Schedule of Cash, Cash Equivalents and Short-term Investments [Table Text Block]

	As of September 30, 2021
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
	(in thousands)
Cash and cash equivalents	$	92,118	$	—	$	—	$	92,118
Securities maturing within one year:
U.S. treasury securities	15,123		1		—		15,124
Corporate debt securities	13,683		—		(7)		13,676
Total short-term investments	$	28,806	$	1	$	(7)	$	28,800
Total cash and cash equivalents and investments	$	120,924	$	1	$	(7)	$	120,918
	As of December 31, 2020
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
			(in thousands)
Cash and cash equivalents	$	126,263	$	—	$	—	$	126,263
Securities maturing within one year:
Corporate debt securities	26,018		5		(11)		26,012
Total short-term investments	$	26,018	$	5	$	(11)	$	26,012
Total cash and cash equivalents and investments	$	152,281	$	5	$	(11)	$	152,275