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Investments (Tables)
 12 Months Ended
Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]  
Summary of Available-for-sale Investments
The following tables summarize the Company’s debt securities classified as available-for-sale at December 31 (in thousands):

AVAILABLE-FOR-SALE INVESTMENTS
2020
(in thousands)
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
Certificates of deposit$5,820 $5 $— $5,825 
US Treasury securities5,908 15 — 5,923 
Commercial paper10,603 1 — 10,604 
Corporate notes and bonds9,779 1 (1)9,779 
Total$32,110 $22 $(1)$32,131 
AVAILABLE-FOR-SALE INVESTMENTS
2019
(in thousands)
Amortized CostGross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
Certificates of deposit$5,646 $17 $— $5,663 
US Treasury securities12,564 16 (1)12,579 
US Agency securities4,002 — (4)3,998 
Commercial paper2,492 — (1)2,491 
Corporate notes and bonds22,711 6 (11)22,706 
Total$47,415 $39 $(17)$47,437 
Summary of Maturities of Available-for-sale Investments
The following table summarizes the maturities of the Company’s debt securities classified as available-for-sale at December 31 (in thousands):

AVAILABLE-FOR-SALE INVESTMENT MATURITIES
(in thousands)
20202019
Amortized
Cost		Fair ValueAmortized
Cost		Fair Value
Due in less than 1 year$32,110 $32,131 $43,627 $43,650 
Due in 1-5 years— — 3,788 3,787 
Total$32,110 $32,131 $47,415 $47,437