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Fair Value Measurements
3 Months Ended
Mar. 31, 2021
Fair Value Disclosures [Abstract]  
Fair Value Measurements FAIR VALUE MEASUREMENTS
The Company evaluates assets and liabilities subject to fair value measurements on a recurring basis to determine the appropriate level to classify them for each reporting period. There have been no transfers between fair value measurements levels during the three months ended March 31, 2021.
 
The authoritative guidance on fair value measurements establishes a consistent framework for measuring fair value on either a recurring or nonrecurring basis whereby inputs, used in valuation techniques, are assigned a hierarchical level. The following are the hierarchical levels of inputs to measure fair value:
 
Level 1: Observable inputs that reflect quoted prices (unadjusted) for identical assets or liabilities in active markets.
Level 2: Observable inputs that reflect quoted prices for identical assets or liabilities in markets that are not active; quoted prices for similar assets or liabilities in active markets; inputs other than quoted prices that are observable for the assets or liabilities; or inputs that are derived principally from or corroborated by observable market data by correlation or other means.
Level 3: Unobservable inputs reflecting the Company’s own assumptions incorporated in valuation techniques used to determine fair value. These assumptions are required to be consistent with market participant assumptions that are reasonably available.
The following table sets forth the Company’s assets and liabilities that were measured at fair value as of March 31, 2021 and December 31, 2020 by level within the fair value hierarchy (in thousands):
 
As of March 31, 2021
 (unaudited)As of December 31, 2020
 Level ILevel
II
Level IIIFair
Value
Level ILevel
II
Level IIIFair
Value
Financial assets:
Cash equivalents:
Money market funds16,772 — — 16,772 10,712 — — 10,712 
Marketable securities:
US Treasury securities28,080 — — 28,080 34,117 — — 34,117 
Prepaid expenses and other current assets:
Forward foreign exchange contracts— — — — — 3,332 — 3,332 
Financial liabilities:
Accrued expenses and other short-term liabilities:
Forward foreign exchange contracts— (453)— (453)— — — — 
Total financial assets (liabilities)$44,852 $(453)$— $44,399 $44,829 $3,332 $— $48,161 

See Note 5 “Convertible Senior Notes and Capped Call Transactions” for the carrying amount and estimated fair value of the Company's 2025 Notes as of March 31, 2021.