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Fair Value Measurements | 9 Months Ended
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Sep. 30, 2020
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 September 30, 2020. 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 September 30, 2020 and December 31, 2019 by level within the fair value hierarchy (in thousands):
| As of September 30, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |
| (unaudited) |  |  |  |  |  |  |  | As of December 31, 2019 |  |  |  |  |  |
| Level I |  | Level II |  | Level III |  | Fair Value |  | Level I |  | Level II |  | Level III |  | Fair Value
Financial assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds | 10,658 |  |  | — |  |  | — |  |  | 10,658 |  |  | 4,789 |  |  | — |  |  | — |  |  | 4,789 |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
US Treasury securities | 34,112 |  |  | — |  |  | — |  |  | 34,112 |  |  | 41,531 |  |  | — |  |  | — |  |  | 41,531 |
Prepaid expenses and other current assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forward foreign exchange contracts | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 5 |  |  | — |  |  | 5 |
Financial liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued expenses and other short-term liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forward foreign exchange contracts | — |  |  | (1,131) |  |  | — |  |  | (1,131) |  |  | — |  |  | (470) |  |  | — |  |  | (470) |
Total financial assets (liabilities) | $ | 44,770 |  |  | $ | (1,131) |  |  | $ | — |  |  | $ | 43,639 |  |  | $ | 46,320 |  |  | $ | (465) |  |  | $ | — |  |  | $ | 45,855 |
See Note 4 “Convertible Senior Notes and Capped Call Transactions” for the carrying amount and estimated fair value of the Company's convertible senior notes as of September 30, 2020.

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- Definition The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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