Fair Value Measurement

12 Months Ended

Dec. 31, 2018

The following table sets forth the fair value of the Company’s financial assets and liabilities measured at fair value on a recurring basis based on the three-tier fair value hierarchy (in thousands):



	December 31, 2018
	Level 1		Level 2		Level 3		Total
Assets
Money market funds^[1]	$	15,223	$	—	$	—	$	15,223
U.S. treasury securities	66,489		—		—		66,489
Corporate bonds	—		19,720		—		19,720
Commercial paper	—		18,529		—		18,529

Liabilities
Redeemable convertible preferred stock warrants	$	—	$	—	$	—	$	—

	December 31, 2017
	Level 1		Level 2		Level 3		Total
Assets
Money market funds^[1]	$	22,115	$	—	$	—	$	22,115

Liabilities
Redeemable convertible preferred stock warrants	$	—	$	—	$	422	$	422


[1]	Included in cash and cash equivalents on the consolidated balance sheet

The following table sets forth a summary of the changes in the fair value of the redeemable convertible preferred stock warrants, the Company’s Level 3 financial liability, which is measured on a recurring basis (in thousands):




Balances at December 31, 2017	$	422
Change in fair value recorded in other (income) expense, net	826
Conversion of preferred stock warrants to common stock warrants	(1,248		)
Balances at December 31, 2018	$	—

- 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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