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Fair Value Measurements - Schedule of Financial Assets at Fair Value (Details) - USD ($) $ in Thousands | Apr. 30, 2019 | Jan. 31, 2019
--- | --- | ---
Assets: |  |
Total cash and cash equivalents | $ 11,372 | $ 15,370
Total short-term investments | 25,803 | 27,253
Commercial Paper |  |
Assets: |  |
Total short-term investments | 9,988 | 8,253
U.S. Government Securities |  |
Assets: |  |
Total short-term investments | 9,827 | 11,088
Corporate Debt Securities |  |
Assets: |  |
Total short-term investments | 2,798 | 4,735
U.S. Agency Securities |  |
Assets: |  |
Total short-term investments | 996 | 990
Asset-backed Securities |  |
Assets: |  |
Total short-term investments | 2,194 | 2,187
Level 1 |  |
Assets: |  |
Total short-term investments | 8,385 | 11,088
Level 1 | U.S. Government Securities |  |
Assets: |  |
Total short-term investments | 8,385 | 11,088
Level 2 |  |
Assets: |  |
Total short-term investments | 17,418 | 16,165
Level 2 | Commercial Paper |  |
Assets: |  |
Total short-term investments | 9,988 | 8,253
Level 2 | U.S. Government Securities |  |
Assets: |  |
Total short-term investments | 1,442 |
Level 2 | Corporate Debt Securities |  |
Assets: |  |
Total short-term investments | 2,798 | 4,735
Level 2 | U.S. Agency Securities |  |
Assets: |  |
Total short-term investments | 996 | 990
Level 2 | Asset-backed Securities |  |
Assets: |  |
Total short-term investments | 2,194 | 2,187
Cash Equivalents |  |
Assets: |  |
Total cash and cash equivalents | 6,650 | 11,380
Cash Equivalents | Commercial Paper |  |
Assets: |  |
Total cash and cash equivalents | 1,998 | 5,429
Cash Equivalents | Money Market Funds |  |
Assets: |  |
Total cash and cash equivalents | 4,652 | 5,951
Cash Equivalents | Level 1 |  |
Assets: |  |
Total cash and cash equivalents | 4,652 | 5,951
Cash Equivalents | Level 1 | Money Market Funds |  |
Assets: |  |
Total cash and cash equivalents | 4,652 | 5,951
Cash Equivalents | Level 2 |  |
Assets: |  |
Total cash and cash equivalents | 1,998 | 5,429
Cash Equivalents | Level 2 | Commercial Paper |  |
Assets: |  |
Total cash and cash equivalents | 1,998 | 5,429
Cash |  |
Assets: |  |
Total cash and cash equivalents | $ 4,722 | $ 3,990

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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