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Cash Equivalents and Short-Term Investments (Tables)
12 Months Ended
Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]  
Available-for-sale Securities
The following table is a summary of our cash equivalents and short-term investments, amortized cost, unrealized gains and losses, and fair value:
December 31, 2020December 31, 2019
CostFair ValueCostUnrealizedFair Value
(in thousands)GainsLosses
Money market funds$267,130 $267,130 $136,258 $— $— $136,258 
Commercial paper113,446 113,446 77,082 — — 77,082 
U.S. treasury securities— — 48,349 — 48,355 
Overnight repurchase agreements— — 15,001 — — 15,001 
U.S. government agency obligations— — 5,993 (5)5,990 
Total cash equivalents and available-for-sale securities$380,576 $380,576 $282,683 $$(5)$282,686 
Classified as:
Cash equivalents$277,629 $163,731 
Short-term investments102,947 118,955 
Total cash equivalents and available-for-sale securities$380,576 $282,686