Fair Value Measurements

6 Months Ended

Sep. 30, 2018

The following tables present information about the Company’s financial assets measured at fair value on a recurring basis as of September 30, 2018 and March 31, 2018 based on the three-tier fair value hierarchy (in thousands):



	Fair Value Measurements as of September 30, 2018
	Level 1		Level 2		Level 3		Total
Cash and cash equivalents:
Money market funds	$	105,478	$	—	$	—	$	105,478
Commercial paper	—		4,981		—		4,981
Short-term investments:
Certificates of deposit	—		29,256		—		29,256
Commercial paper	—		45,873		—		45,873
Corporate notes and bonds	—		18,395		—		18,395
U.S. treasury securities	409,793		—		—		409,793
U.S. government agencies	—		30,994		—		30,994
Restricted cash:
Money market funds	8,203		—		—		8,203
Total	$	523,474	$	129,499	$	—	$	652,973
Included in cash and cash equivalents							$	110,459
Included in short-term investments							$	534,311
Included in restricted cash							$	8,203

	Fair Value Measurements as of March 31, 2018
	Level 1		Level 2		Level 3		Total
Cash and cash equivalents:
Money market funds	$	38,458	$	—	$	—	$	38,458
Commercial paper	—		21,710		—		21,710
U.S. treasury securities	2,698		—		—		2,698
U.S. government agencies	—		5,498		—		5,498
Short-term investments:
Certificates of deposit	—		20,492		—		20,492
Commercial paper	—		21,699		—		21,699
Corporate notes and bonds	—		9,794		—		9,794
U.S. treasury securities	40,187		—		—		40,187
U.S. government agencies	—		23,269		—		23,269
Restricted cash:
Money market funds	8,202		—		—		8,202
Total	$	89,545	$	102,462	$	—	$	192,007
Included in cash and cash equivalents							$	68,364
Included in short-term investments							$	115,441
Included in restricted cash							$	8,202

There were no transfers between fair value measurement levels during the six months ended September 30, 2018 and 2017.

Gross unrealized gains or losses for cash equivalents and short-term investments as of September 30, 2018 and March 31, 2018 were not significant. As of September 30, 2018 and March 31, 2018, there were no securities that were in an unrealized loss position for more than 12 months.

The following table classifies the Company’s available-for-sale short-term investments by contractual maturities as of September 30, 2018 and March 31, 2018 (in thousands):



	September 30, 2018		March 31, 2018
Due within one year	$	393,734	$	96,924
Due after one year through two years	140,577		18,517
Total	$	534,311	$	115,441

For certain other financial instruments, including accounts receivable, accounts payable and other current liabilities, the carrying amounts approximate their fair value due to the relatively short maturity of these balances.

Convertible Senior Notes

As of September 30, 2018, the fair value of the Notes was $488.8 million. The fair value was determined based on the quoted price of the Notes in an inactive market on the last trading day of the reporting period and has been classified as Level 2 in the fair value hierarchy.

- 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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