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Fair Value Measurements
3 Months Ended
Mar. 31, 2022
Fair Value Disclosures [Abstract]  
Fair Value Measurements Fair Value Measurements
The following table details the assets carried at fair value and measured on a recurring basis within the three levels of fair value as of March 31, 2022 and December 31, 2021:
(in thousands)Gross UnrealizedReported as:
March 31, 2022Amortized CostGainsLossesFair ValueCash and cash equivalentsShort-term investmentsLong-term investments
Level 1
Mutual funds$9,037 $— $— $9,037 $9,037 $— $— 
U.S. treasury securities28,803 11 (75)28,739 — 15,030 13,709 
Total Level 137,840 11 (75)37,776 9,037 15,030 13,709 
Level 2
Commercial paper292,994 (235)292,761 179,585 113,176 — 
Corporate debt securities7,406 — (117)7,289 — 7,289 — 
Agency bonds11,349 (141)11,209 — — 11,209 
Total Level 2311,749 (493)311,259 179,585 120,465 11,209 
Total Level 1 and Level 2$349,589 $14 $(568)$349,035 $188,622 $135,495 $24,918 
(in thousands)Gross UnrealizedReported as:
December 31, 2021Amortized CostGainsLossesFair ValueCash and cash equivalentsShort-term investmentsLong-term investments
Level 1
Mutual funds$21,925 $— $— $21,925 $21,925 $— $— 
U.S. treasury securities15,156 — (20)15,136 — 15,136 — 
Total Level 137,081 — (20)37,061 21,925 15,136 — 
Level 2
Commercial paper301,906 (90)301,818 163,694 138,124 — 
Corporate debt securities14,299 — (36)14,263 — 6,850 7,413 
Agency bonds8,998 — (40)8,958 — — 8,958 
Total Level 2325,203 (166)325,039 163,694 144,974 16,371 
Total Level 1 and Level 2$362,284 $$(186)$362,100 $185,619 $160,110 $16,371 
Contractual maturities of short-term investments as of March 31, 2022 and December 31, 2021 are due in one year or less. Contractual maturities of long-term investments as of March 31, 2022 and December 31, 2021 are due after 1 year through 2 years.