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Fair Value Measurements
3 Months Ended
Mar. 31, 2021
Fair Value Disclosures [Abstract]  
Fair Value Measurements Fair Value MeasurementsASC Topic 820, Fair Value Measurements and Disclosures, establishes a framework for measuring fair value and the corresponding disclosure requirements around fair value measurements. This topic applies to all financial instruments that are being measured and reported on a fair value basis.
The following table shows the fair value measurements of the Company's assets that are measured at fair value on a recurring basis as of March 31, 2021 and 2020.
Fair Value Measurements as of March 31, 2021
Level ILevel IILevel IIITotal
(in thousands)
Assets
 Cash and cash equivalents $334,718 $— $— $334,718 
 Held-to-maturity investments:
 Commercial paper — 116,634 — 116,634 
 State and municipal bonds — 15,784 — 15,784 
 Corporate bonds and notes — 164,203 — 164,203 
Total Assets$334,718 $296,621 $— $631,339 
Fair Value Measurements as of December 31, 2020
Level ILevel IILevel IIITotal
(in thousands)
Assets
 Cash and cash equivalents $389,705 $— $— $389,705 
 Held-to-maturity investments:
 Treasury securities — 149,995 — 149,995 
 Commercial paper — 37,948 — 37,948 
 Corporate bonds and notes — 49,829 — 49,829 
Total Assets$389,705 $237,772 $— $627,477