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Fair Value Measurements | 9 Months Ended
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Oct. 31, 2018
Fair Value Disclosures [Abstract] |
Fair Value Measurements | Fair Value Measurements The following tables present information about the Company’s financial assets and liabilities that have been measured at fair value on a recurring basis as of October 31, 2018 and January 31, 2018, and indicate the fair value hierarchy of the valuation inputs utilized to determine such fair value (in thousands):
| Fair Value Measurement at October 31, 2018
| Level 1 |  | Level 2 |  | Level 3 |  | Total
Financial Assets: |  |  |  |  |  |  |
Cash and cash equivalents: |  |  |  |  |  |  |
Money market funds | $ | 893 |  |  | $ | — |  |  | $ | — |  |  | $ | 893 |
Short-term investments: |  |  |  |  |  |  |
U.S. government treasury securities | 382,681 |  |  | — |  |  | — |  |  | 382,681 |
Total financial assets | $ | 383,574 |  |  | $ | — |  |  | $ | — |  |  | $ | 383,574 |
| Fair Value Measurement at January 31, 2018
| Level 1 |  | Level 2 |  | Level 3 |  | Total
Financial Assets: |  |  |  |  |  |  |
Cash and cash equivalents: |  |  |  |  |  |  |
Money market funds | $ | 45,918 |  |  | $ | — |  |  | $ | — |  |  | $ | 45,918 |
Short-term investments: |  |  |  |  |  |  |
U.S. government treasury securities | 217,072 |  |  | — |  |  | — |  |  | 217,072 |
Total financial assets | $ | 262,990 |  |  | $ | — |  |  | $ | — |  |  | $ | 262,990 |
The Company utilized the market approach and Level 1 valuation inputs to value its money market mutual funds and U.S. government treasury securities because published net asset values were readily available. As of October 31, 2018 and January 31, 2018, gross unrealized gains and unrealized losses for cash equivalents and short-term investments were not material, and the contractual maturity of all marketable securities was less than one year. In addition to its cash, cash equivalents and short-term investments, the Company measures the fair value of its outstanding Notes (as defined below) on a quarterly basis for disclosure purposes. The Company considers the fair value of the Notes at October 31, 2018 to be a Level 2 measurement due to limited trading activity of the Notes. Refer to Note 4, Convertible Senior Notes, to the condensed consolidated financial statements for further details.

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -URI http://asc.fasb.org/topic&trid=2155941 + Details
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