Cash and Cash Equivalents and Investments (Tables)

3 Months Ended

Mar. 31, 2021

Cash and Cash Equivalents and Investments [Abstract]

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

	As of March 31, 2021
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
	(in thousands)
Cash and cash equivalents	$	97,652	$	—	$	—	$	97,652
Securities maturing within one year:
U.S. treasury securities	15,243		2		—		15,245
Corporate debt securities	28,461		10		(7)		28,464
Total short-term investments	$	43,704	$	12	$	(7)	$	43,709
Total cash and cash equivalents and investments	$	141,356	$	12	$	(7)	$	141,361
	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