FAIR VALUE MEASUREMENTS

6 Months Ended

Sep. 30, 2020

Cash, cash equivalents, restricted cash, and available-for-sale investments were as follows (in thousands):


As of September 30, 2020	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	$	32,611	$	—	$	—	$	32,611	$	25,694	$	6,917	$	—	$	—
Level 1:
Money market funds	94,354		—		—		94,354		94,354		—		—		—
Treasury securities	6,185		68		—		6,253		—		—		6,253		—
Subtotal	133,150		68		—		133,218		120,048		6,917		6,253		—
Level 2:
Certificate of deposit	8,641		—		—		8,641		—		8,641		—		—
Commercial paper	4,399		—		—		4,399		1,800		—		2,599
Corporate debt	28,586		124		—		28,710		—		—		22,529		6,181
Subtotal	41,626		124		—		41,750		1,800		8,641		25,128		6,181
Total assets	$	174,776	$	192	$	—	$	174,968	$	121,848	$	15,558	$	31,381	$	6,181


As of March 31, 2020	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	$	31,378	$	—	$	—	$	31,378	$	21,002	$	10,376	$	—	$	—
Level 1:
Money market funds	110,796		—		—		110,796		110,796		—		—		—
Treasury securities	6,192		116		—		6,308		—		—		—		6,308
Subtotal	148,366		116		—		148,482		131,798		10,376		—		6,308
Level 2:
Certificate of deposit	8,641		—		—		8,641		—		8,641		—		—
Commercial paper	14,979		6		—		14,985		5,596		—		9,389		—
Corporate debt	34,153		32		(341)		33,844		—		—		24,069		9,775
Subtotal	57,773		38		(341)		57,470		5,596		8,641		33,458		9,775
Total assets	$	206,139	$	154	$	(341)	$	205,952	$	137,394	$	19,017	$	33,458	$	16,083

Certificate of deposit represents the Company's letter of credits securing leases for office facilities, and the balance of which is included in restricted cash, non-current in the Company's condensed consolidated balance sheet.

The Company considers its investments as available to support its current operations, and it has classified all investments as available-for-sale securities. As of September 30, 2020, for investments that were in unrealized loss positions, the Company does not have the intent to sell any of these investments and 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 basis.

The Company regularly reviews the changes to the rating of its securities at the individual security level by rating agencies as well as reasonably monitors the surrounding economic conditions to assess the risk of expected credit losses. As of September 30, 2020, the Company did not have any risk of expected credit losses.

As of September 30, 2020, the estimated fair value of the Company's outstanding convertible senior notes (the "Notes") was $336.7 million, which was determined based on the closing price for the Notes on the last trading day of the reporting period and is considered to be Level 2 in the fair value hierarchy due to limited trading activity of the Notes.

- 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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