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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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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.

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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

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