Fair Value Measurements

12 Months Ended

Dec. 31, 2017

4. Fair Value Measurements

Assets measured at fair value on a recurring basis as of December 31, 2017 are as follows (in thousands):


			Quoted Prices		Significant
			in Active		Other		Significant
			Markets for		Observable		Unobservable
	December 31,		Identical Assets		Inputs		Inputs
Financial Assets	2017		(Level 1)		(Level 2)		(Level 3)
Cash and cash equivalents
Money market funds	$	134,635	$	134,635	$	—	$	—
U.S. Treasuries		11,995		11,995		—		—
Marketable securities:
U.S. Treasuries		123,559		123,559		—		—
Government agency securities		58,950		58,950		—		—
Money market funds, included in restricted cash		1,619		1,619		—		—
Total financial assets	$	330,758	$	330,758	$	—	$	—

Assets and liabilities measured at fair value on a recurring basis as of December 31, 2016 are as follows (in thousands):


			Quoted Prices		Significant
			in Active		Other		Significant
			Markets for		Observable		Unobservable
	December 31,		Identical Assets		Inputs		Inputs
Financial Assets	2016		(Level 1)		(Level 2)		(Level 3)
Cash and cash equivalents	$	185,323	$	185,323	$	—	$	—
Money market funds, included in other current assets		1,619		1,619		—		—
Total financial assets	$	186,942	$	186,942	$	—	$	—

There were no transfers between fair value measurement levels during the years ended December 31, 2017 or 2016.

- 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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