FAIR VALUE MEASUREMENTS

6 Months Ended

Sep. 30, 2021

The following tables presents estimated fair values of cash, cash equivalents, restricted cash, and available-for-sale investments:


September 30, 2021	Amortized Costs		Gross Unrealized Gain		Gross Unrealized Loss		Estimated Fair Value		Cash and Cash Equivalents		Restricted Cash (Current & Non-Current)		Short-Term Investments		Long-Term Investments
Cash	$	43,131	$	—	$	—	$	43,131	$	43,131	$	—	$	—	$	—
Level 1:
Money market funds	58,458		—		—		58,458		58,458		—		—		—

Subtotal	101,589		—		—		101,589		101,589		—		—		—
Level 2:
Certificate of deposit	8,641		—		—		8,641		—		8,641		—		—

Commercial paper	27,412		1		(1)		27,412		1,400		—		26,012		—
Corporate debt	28,828		17		(5)		28,840		—		—		18,595		10,245
Subtotal	64,881		18		(6)		64,893		1,400		8,641		44,607		10,245
Total assets	$	166,470	$	18	$	(6)	$	166,482	$	102,989	$	8,641	$	44,607	$	10,245


March 31, 2021	Amortized Costs		Gross Unrealized Gain		Gross Unrealized Loss		Estimated Fair Value		Cash and Cash Equivalents		Restricted Cash (Current & Non-Current)		Short-Term Investments		Long-Term Investments
Cash	$	39,070	$	—	$	—	$	39,070	$	39,070	$	—	$	—	$	—
Level 1:
Money market funds	67,712		—		—		67,712		67,712		—		—		—
Treasury securities	6,177		17		—		6,194		—		—		6,194		—
Subtotal	112,959		17		—		112,976		106,782		—		6,194		—
Level 2:
Certificate of deposit	8,641		—		—		8,641		—		8,641		—		—
Commercial paper	17,656		42		—		17,698		700		—		16,998		—
Corporate debt	22,193		1		—		22,194		5,049		—		17,145		—
Subtotal	48,490		43		—		48,533		5,749		8,641		34,143		—
Total assets	$	161,449	$	60	$	—	$	161,509	$	112,531	$	8,641	$	40,337	$	—

Certificates of deposit represent the Company's letters of credit securing leases for office facilities, the balances of which are included in Restricted cash, current and Restricted cash, non-current on the Company's Condensed Consolidated Balance Sheets.

The Company considers its investments available to support its current operations and has classified all investments as available-for-sale securities. The Company does not intend to sell any of its investments that are in unrealized loss positions and, as of September 30, 2021, has determined that it is not more likely than not that it will be required to sell any of these investments before recovery of the entire amortized cost bases.

The Company regularly reviews the changes to the rating of its securities at the individual security level by rating agencies and reasonably monitors the surrounding economic conditions to assess the risk of expected credit losses. As of September 30, 2021, the Company did not have any risk of expected credit losses on its investments.

As of September 30, 2021 and March 31, 2021, the estimated fair value of the Company's outstanding convertible senior notes ("Notes") was $407.9 million and $502.9 million, respectively, which was determined based on the closing price for the Notes on the last trading day of the reporting period and is categorized within Level 2 of the fair value hierarchy due to limited trading activity of the Notes. See Note 8, Convertible Senior Notes and Capped Call.

- 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.

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