In the second quarter of fiscal year 2023, the Company resumed its investments in money market funds and debt securities after a full liquidation of its investments in fiscal year 2022 to finance the acquisition of Oculii Corporation, or Oculii. The debt security investment portfolio consists of commercial paper, debt securities of corporations or corporate bonds, asset-backed securities and U.S. government securities. All of the investments are denominated in United States dollars and reported at fair value as available-for-sale securities in the condensed consolidated balance sheets as follows:

	As of October 31, 2022
	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
	(in thousands)
Money market funds	$	13,525	$	—	$	—		$	13,525
Commercial paper		18,161		—		—			18,161
Corporate bonds		21,390		1		(425	)		20,966
Asset-backed securities		16,287		—		(260	)		16,027
U.S. government securities		31,402		—		(359	)		31,043
Total cash equivalents and marketable debt securities	$	100,765	$	1	$	(1,044	)	$	99,722

	As of January 31, 2022
	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
	(in thousands)
Money market funds	$	20	$	—	$	—		$	20
Total cash equivalents and marketable debt securities	$	20	$	—	$	—		$	20

As of October 31, 2022, there were no debt securities with unrealized losses for more than twelve months.

	As of
	October 31, 2022		January 31, 2022
	(in thousands)
Included in cash equivalents	$	13,525	$	20
Included in marketable debt securities		86,197		—
Total cash equivalents and marketable debt securities	$	99,722	$	20

The contractual maturities of the investments at October 31, 2022 and January 31, 2022 were as follows:

	As of
	October 31, 2022		January 31, 2022
	(in thousands)
Less than one year	$	54,829	$	20
Due in 1 - 5 years		44,893		—
Total cash equivalents and marketable debt securities	$	99,722	$	20

The unrealized gains and losses on the available-for-sale securities were primarily caused by fluctuations in market value and interest rates as a result of the economic environment. In accordance with ASU No. 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, the Company estimates the expected losses at an individual security level whenever a security’s fair value is below its amortized cost basis using the discounted cash flow method. The credit-related portion of the loss is recognized in other income, net in the condensed consolidated statements of operations but is limited to the difference between the fair value and the amortized cost basis of the security, adjusted for accrued interest. The non-credit-related portion of the loss is recognized in accumulated other comprehensive loss in the condensed consolidated balance sheets. The credit-related losses were not material for the three and nine months ended October 31, 2022, and 2021, respectively.

Interest income, including amortization of premiums and accretion of discounts related to the investments, as well as realized gains and losses from sales of the investments are recorded in other income, net, in the condensed consolidated statements of operations. For the three months ended October 31, 2022 and 2021, interest income and realized gains, net, was approximately $0.7 million and $0.7 million, respectively. For the nine months ended October 31, 2022 and 2021, interest income and realized gains, net, were approximately $0.8 million and $1.7 million, respectively.

The following fair value hierarchy is applied for disclosure of the inputs used to measure fair value. This hierarchy prioritizes the inputs into three broad levels as follows:

Level 1—Inputs are unadjusted quoted prices in active markets for identical assets or liabilities.

Level 2—Inputs are quoted prices for similar assets and liabilities in active markets or inputs that are observable for the assets or liabilities, either directly or indirectly through market corroboration, for substantially the full term of the financial instruments.

Level 3—Unobservable inputs based on the Company’s own assumptions used to measure assets and liabilities at fair value. The inputs require significant management judgment or estimation.

The Company measures the fair value of money market funds using quoted prices in active markets for identical assets and classifies them within Level 1. The fair value of the Company’s investments in other debt securities are obtained based on quoted prices for similar assets in active markets and are classified within Level 2.

The following tables present the fair value of the financial instruments measured on a recurring basis as of October 31, 2022 and January 31, 2022, respectively:

	As of October 31, 2022
	Total		Level 1		Level 2		Level 3
	(in thousands)
Money market funds	$	13,525	$	13,525	$	—	$	—
Commercial paper		18,161		—		18,161		—
Corporate bonds		20,966		—		20,966		—
Asset-backed securities		16,027		—		16,027		—
U.S. government securities		31,043		—		31,043		—
Total cash equivalents and marketable debt securities	$	99,722	$	13,525	$	86,197	$	—

	As of January 31, 2022
	Total		Level 1		Level 2		Level 3
	(in thousands)
Money market funds	$	20	$	20	$	—	$	—
Total cash equivalents and marketable debt securities	$	20	$	20	$	—	$	—