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Fair Value Measurements
9 Months Ended
Jan. 31, 2021
Fair Value Disclosures [Abstract]  
Fair Value Measurements Fair Value Measurements
The Company’s financial instruments consist primarily of cash and cash equivalents, marketable debt securities, accounts receivable, non-marketable equity securities, and accounts payable. Cash and cash equivalents and marketable debt securities are reported at their respective fair values on the consolidated balance sheets. Non-marketable equity securities are reported at cost less impairment. The remaining financial instruments are reported on the consolidated balance sheets at amounts that approximate current fair values.
The following table summarizes the types of assets measured at fair value on a recurring basis by level within the fair value hierarchy (in thousands):
As of January 31, 2021As of April 30, 2020
Level 1Level 2Level 3TotalLevel 1Level 2Level 3Total
Money market funds$900,292 $— $— $900,292 $10,260 $— $— $10,260 
U.S. treasury securities
— 158,377 — 158,377 — 11,500 — 11,500 
Certificate of deposit— 3,503 — 3,503 — 28,477 — 28,477 
U.S. government agencies securities
— — — — — 10,074 — 10,074 
Commercial paper— 2,000 — 2,000 — 94,397 — 94,397 
Corporate debt securities
— — — — — 68,425 — 68,425 
$900,292 $163,880 $— $1,064,172 $10,260 $212,873 $— $223,133 
The estimated fair value of securities classified as Level 2 financial instruments was determined based on third-party pricing services. The pricing services utilize industry standard valuation models, including both income- and market-based approaches, for which all significant inputs are observable, either directly or indirectly, to estimate fair value. Inputs used for fair value measurement categorized as Level 2 include benchmark yields, reported trades, broker or dealer quotes, issuer spreads, two-sided markets, benchmark securities, bids, offers, and reference data including market research publications.