Fair Value Measurements (Tables)

6 Months Ended

Jul. 31, 2019

Fair Value Disclosures [Abstract]

Schedule of Financial Instruments Measured at Fair Value on Recurring Basis

The following table presents information about our financial instruments that are measured at fair value on a recurring basis using the input categories further discussed in Note 1. “Summary of Business and Significant Accounting Policies” in the Notes to Consolidated Financial Statements in our Prospectus:

	July 31, 2019
	Fair Value		Level 1		Level 2		Level 3
	(in thousands)
Financial Assets:
Money market funds	$	95,577	$	95,577	$	—	$	—
Commercial paper	14,239		—		14,239		—
Corporate debt securities	4,900		—		4,900		—
Treasury bills	19,487		—		19,487		—
Cash equivalents	134,203		95,577		38,626		—
Commercial paper	54,007		—		54,007		—
Agency bonds	18,399		—		18,399		—
Corporate and other debt securities	269,209		—		269,209		—
U.S. government agency securities	97,762		—		97,762		—
Treasury bills	102,003		—		102,003		—
Marketable securities	541,380		—		541,380		—
Certificate of deposit	100		—		100		—
Prepaid expenses and other current assets	100		—		100		—
Certificates of deposit	2,044		—		2,044		—
Other assets, non-current	2,044		—		2,044		—
Total financial assets	$	677,727	$	95,577	$	582,150	$	—

	January 31, 2019
	Fair Value		Level 1		Level 2		Level 3
	(in thousands)
Financial Assets:
Money market funds	$	78	$	78	$	—	$	—
Cash equivalents	78		78		—		—
Commercial paper	1,243		—		1,243		—
Corporate bonds	53,214		—		53,214		—
Agency bonds	32,604		—		32,604		—
U.S. government agency securities	24,017		—		24,017		—
Treasury bills	1,699		—		1,699		—
Marketable securities	112,777		—		112,777		—
Certificate of deposit	200		—		200		—
Prepaid expenses and other current assets	200		—		200		—
Certificates of deposit	2,144		—		2,144		—
Other assets, non-current	2,144		—		2,144		—
Total financial assets	$	115,199	$	78	$	115,121	$	—
Financial Liabilities:
Convertible promissory notes – derivative liabilities	$	163	$	—	$	—	$	163
Other liabilities, non-current	163		—		—		163
Total financial liabilities	$	163	$	—	$	—	$	163

Summary of Changes in Fair Value of Financial Instruments

The following table sets forth a summary of the changes in the fair value of our Level 3 financial instruments as follows:

	Derivative Liabilities
	(in thousands)
Balance - January 31, 2019	$	163
Extinguishment of derivative liabilities from the convertible promissory notes in connection with the IPO	(163)
Balance - July 31, 2019	$	—