FAIR VALUE MEASUREMENTS

6 Months Ended

Sep. 30, 2015

3. FAIR VALUE MEASUREMENTS

The carrying amounts of our financial instruments, including cash and cash equivalents, restricted cash, accounts receivable, accounts payable and accrued liabilities, approximate fair value because of their short maturities. We consider all highly liquid instruments purchased with original maturities of three months or less to be cash equivalents. Our restricted cash balance is primarily related to a dedicated account limited to the payment of certain royalty obligations.

We follow a three-level fair value hierarchy that prioritizes the inputs used to measure fair value. This hierarchy requires entities to maximize the use of "observable inputs" and minimize the use of "unobservable inputs." The three levels of inputs used to measure fair value are as follows:


	•	Level 1—Quoted prices in active markets for identical assets or liabilities.
	•	Level 2—Observable inputs other than quoted prices included in Level 1, such as quoted prices for markets that are not active or other inputs that are observable or can be corroborated by observable market data.
	•	Level 3—Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. This includes certain pricing models, discounted cash flow methodologies and similar techniques that use significant unobservable inputs.

The table below segregates all assets that are measured at fair value on a recurring basis (which is measured at least annually) into the most appropriate level within the fair value hierarchy based on the inputs used to determine the fair value at the measurement date.

	September 30, 2015			Quoted prices in active markets for identical assets (level 1)		Significant other observable inputs (level 2)			Significant unobservable inputs (level 3)		Balance Sheet Classification
Money market funds	$	503,466		$	503,466	$	—		$	—	Cash and cash equivalents
Bank-time deposits		31,971			31,971		—			—	Cash and cash equivalents
Corporate bonds		104,371			—		104,371			—	Short-term investments
Bank-time deposits		248,590			248,590		—			—	Short-term investments
Foreign currency forward contracts		(177	)		—		(177	)		—	Accrued and other current liabilities

Total recurring fair value measurements, net	$	888,221		$	784,027	$	104,194		$	—

	March 31, 2015		Quoted prices in active markets for identical assets (level 1)		Significant other observable inputs (level 2)		Significant unobservable inputs (level 3)		Balance Sheet Classification
Money market funds	$	544,334	$	544,334	$	—	$	—	Cash and cash equivalents
Bank-time deposits		79,852		79,852		—		—	Cash and cash equivalents
Corporate bonds		99,429		—		99,429		—	Short-term investments
Bank-time deposits		87,500		87,500		—		—	Short-term investments
Foreign currency forward contracts		587		—		587		—	Prepaid expenses and other

Total recurring fair value measurements, net	$	811,702	$	711,686	$	100,016	$	—

The Company did not have any transfers between Level 1 and Level 2 fair value measurements during the six months ended September 30, 2015.

Debt

As of September 30, 2015, the estimated fair value of the Company's 1.75% Convertible Notes due 2016 (the "1.75% Convertible Notes") and 1.00% Convertible Notes due 2018 (the "1.00% Convertible Notes" and together with the 1.75% Convertible Notes, the "Convertible Notes") was $385,400 and $409,486, respectively. The fair value was determined using Level 2 inputs, observable market data, for the Convertible Notes and its embedded option feature. See Note 9 for additional information regarding our Convertible 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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