Investments (Tables)

12 Months Ended

Dec. 31, 2019

Investments, Debt and Equity Securities [Abstract]

Summary of Available-for-sale Investments

The following tables summarize the Company’s available-for-sale investments at December 31 (in thousands):

AVAILABLE-FOR-SALE INVESTMENTS
2019
(in thousands)
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Certificates of deposit	$	5,646	$	17	$	—		$	5,663
US Treasury securities	12,564		16		(1		)	12,579
US Agency securities	4,002		—		(4		)	3,998
Commercial paper	2,492		—		(1		)	2,491
Corporate notes and bonds	22,711		6		(11		)	22,706
Total	$	47,415	$	39	$	(17	)	$	47,437

AVAILABLE-FOR-SALE INVESTMENTS
2018
(in thousands)
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Certificates of deposit	$	10,787	$	—	$	—		$	10,787
US Treasury securities	22,185		1		(66		)	22,120
US Agency securities	8,024		1		(45		)	7,980
Commercial paper	17,025		—		—			17,025
Asset-backed securities	12,007		—		(9		)	11,998
Corporate notes and bonds	30,361		—		(53		)	30,308
Total	$	100,389	$	2	$	(173	)	$	100,218

Summary of Maturities of Available-for-sale Investments

The following table summarizes the maturities of the Company’s available-for-sale securities at December 31 (in thousands):

AVAILABLE-FOR-SALE INVESTMENT MATURITIES
(in thousands)
	2019				2018
	Amortized Cost		Fair Value		Amortized Cost		Fair Value
Due in less than 1 year	$	43,627	$	43,650	$	83,030	$	82,893
Due in 1-5 years	3,788		3,787		17,359		17,325
Total	$	47,415	$	47,437	$	100,389	$	100,218