Fair Value Measurements

12 Months Ended

Dec. 31, 2015

4. Fair Value Measurements

The following table sets forth the Company’s financial instruments that were measured at fair value on a recurring basis by level within the fair value hierarchy (in thousands):

	Fair Value Measurements at December 31, 2015
	Total		Level 1		Level 2		Level 3
Assets
Money market funds	$	132,647	$	132,647	$	—	$	—

	Fair Value Measurements at December 31, 2014
	Total		Level 1		Level 2		Level 3
Assets
Money market funds	$	160,125	$	160,125	$	—	$	—

The Company recognizes transfers between levels of the fair value hierarchy as of the end of the reporting period. There were no transfers within the hierarchy during the years ended December 31, 2015 or 2014.

The following table sets forth a summary of the changes in the fair value of the Company’s Level 3 financial instruments as follows:

	Convertible			Convertible
	preferred stock			preferred stock
	call option			warrant
	liability			liability
Balance at January 1, 2014	$	21		$	474
Change in fair value recorded in other income (expense), net		9,560			2,278
Conversion of preferred stock into common stock and reclassification to permanent equity		(9,581	)		(2,752	)
Balance at December 31, 2014	$	—		$	—

- 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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