Fair Value Measurements

12 Months Ended

Dec. 31, 2017

We define fair value as the price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Valuation techniques we use to measure fair value maximize the use of observable inputs and minimize the use of unobservable inputs. We classify the inputs used to measure fair value into the following hierarchy:



Level 1		Unadjusted quoted prices in active markets for identical assets or liabilities
Level 2		Unadjusted quoted prices in active markets for similar assets or liabilities, or
		Unadjusted quoted prices for identical or similar assets or liabilities in markets that are not active, or
		Inputs other than quoted prices that are observable for the asset or liability
Level 3		Unobservable inputs for the asset or liability

Our cash equivalents were invested in money market funds and were classified as Level 1. We endeavor to utilize the best available information in measuring fair value. We used observable prices in active markets in determining the classification of our money market funds as Level 1.

The following table is a summary of financial assets measured at fair value on a recurring basis and their classification within the fair value hierarchy (in thousands).



	December 31, 2016						December 31, 2017
	Carrying Value		Level 1		Total		Carrying Value		Level 1		Total
Assets
Money market funds	$	57,715	$	57,715	$	57,715	$	35,195	$	35,195	$	35,195

- 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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