Fair Value Measurements

12 Months Ended

Dec. 31, 2013

4. Fair Value Measurements

Account balances measured at fair value on a recurring basis include the following as of December 31, 2013 and 2012:


	December 30,
	2013						2012
	Level 1		Level 2		Level 3		Level 1		Level 2		Level 3
Cash equivalents
Money market funds	$	98,987	$	—	$	—	$	19,930	$	—	$	—
Long-term liabilities
Preferred stock warrant obligation		—		—		—		—		—		507

The following table presents the changes in the preferred stock warrant obligation measured and recorded at fair value on a recurring basis, using significant unobservable inputs (Level 3) during 2013, 2012 and 2011:


	Years Ended December 31,
	2013			2012		2011
Balances at beginning of period	$	507		$	145	$	72
Change in unrealized loss included in earnings		238			362		73
Conversion to common stock warrant		(745	)		—		—

Balances at end of period	$	—		$	507	$	145

The Company’s cash equivalents as of December 31, 2013 and 2012 consisted of money market funds with original maturity dates of less than three months from the date of their respective purchase. Cash equivalents are classified as Level 1. The fair value of the Company’s money market funds approximated amortized cost and, as such, there were no unrealized gains or losses on money market funds as of December 31, 2013 and 2012. As of December 31, 2013 and 2012, amounts of $5,420 and $11,610, respectively, were held in bank deposits.

- 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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