Investments (Tables)

12 Months Ended

Dec. 31, 2019

Investments

Schedule of investments in fixed income securities

	As of December 31, 2018
	Amortized						Fair
(in thousands)	cost		Gains		Losses		Value
Corporate debt securities	$	6,556	$	—	$	(1)	$	6,555
Commercial paper		53,600		1		(3)		53,598
Total	$	60,156	$	1	$	(4)	$	60,153

Summary of balance sheet classification of investments

	As of December 31,
(in thousands)	2018
Cash equivalents	$	59,156
Short-term investments		1,000
Total investments	$	60,156

Schedule of held-to-maturity investments by contractual maturity

	As of December 31,
	2018
	Gross
	Amortized		Fair
(in thousands)	Cost		Value
Due in one year or less	$	60,156	$	60,153
Due after one year through five years		—		—
Total	$	60,156	$	60,153