Fair Value Measurements

9 Months Ended

Sep. 30, 2021

FAIR VALUE MEASUREMENTS

The Company records its financial assets and liabilities at fair value. The carrying amounts of certain financial instruments of the Company, including cash and cash equivalents, prepaid expenses and other current assets, accounts payable and accrued liabilities, approximate fair value due to their relatively short maturities. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability (an exit price) in an orderly transaction between market participants at the reporting date. The accounting guidance establishes a three-tiered hierarchy, which prioritizes the inputs used in the valuation methodologies in measuring fair value as follows:

•Level 1: Inputs that include quoted prices in active markets for identical assets and liabilities.

•Level 2: Inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices for similar assets or liabilities, quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.

•Level 3: Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.

The following table sets forth the Company’s financial assets and liabilities, measured at fair value on a recurring basis, as of September 30, 2021 and December 31, 2020 (in thousands):


	September 30, 2021
	Fair Value Measured Using
	(Level 1)		(Level 2)		(Level 3)		Total Balance
Assets
Cash equivalents:
Money market funds	$	334,895	$	—	$	—	$	334,895
Long-term marketable securities:
Corporate equity securities	4,833		—		—		4,833
Corporate debt securities	—		500		—		500
Total	$	339,728	$	500	$	—	$	340,228
Liabilities
Common stock warrant liability	$	—	$	—	$	195	$	195


	December 31, 2020
	Fair Value Measured Using
	(Level 1)		(Level 2)		(Level 3)		Total Balance
Assets
Cash equivalents:
Money market funds	$	85,797	$	—	$	—	$	85,797
Liabilities
Common stock warrant liability	$	—	$	—	$	447	$	447

The following table presents the issuances, exercises, changes in fair value and reclassifications of the Company’s Level 3 financial instruments that are measured at fair value on a recurring basis (in thousands):


	(Level 3)
	Common Stock Warrant Liability
Balance as of December 31, 2020	$	447
Exercise of warrants	(202)
Change in estimated fair value	(50)
Balance as of September 30, 2021	$	195

As of September 30, 2021, the Company had one investment in convertible preferred shares carried at cost. In the event the Company had to calculate the fair value of this investment, it would be based on Level 3 inputs. This investment is not considered material to the Company's condensed consolidated financial statements.

In determining fair value, the Company uses various valuation approaches within the fair value measurement framework. The valuation methodologies used for the Company’s instruments measured at fair value and their classification in the valuation hierarchy are summarized below:

•Money market funds – Investments in money market funds are classified within Level 1. Money market funds are valued at the closing price reported by the fund sponsor from an actively traded exchange. At September 30, 2021 and December 31, 2020, money market funds were included as cash and cash equivalents in the condensed consolidated balance sheets.

•Short-term marketable securities – Investments in short-term marketable securities are classified within Level 2. The securities are valued using third-party pricing sources. The pricing services utilize industry standard valuation models, including both income and market-based approaches, for which all significant inputs are observable, either directly or indirectly.

•Long-term marketable equity and debt securities – Investments in long-term marketable equity securities are classified within Level 1. The securities are recorded at fair value based on readily available quoted market

prices in active markets. Investments in long-term marketable debt securities are classified within Level 2. The securities are recorded at fair value based on observable inputs for quoted prices for identical or similar assets in markets that are not active. Long-term marketable securities are located within other assets on the condensed consolidated balance sheets.

•Common stock warrant liability – Common stock warrant liability is classified within Level 3. The Company utilizes a binomial-lattice pricing model (the “Monte Carlo Simulation Model”) that involves a market condition simulation to estimate the fair value of the warrants. The application of the Monte Carlo Simulation Model requires the use of a number of complex assumptions, including the Company’s stock price, expected life of the warrants, stock price volatility determined from the Company’s historical stock prices and stock prices of peer companies in the diagnostics industry, and risk-free rates based on the implied yield currently available in the U.S. Treasury zero-coupon issues with a remaining term equal to the expected life of the warrants. Increases (decreases) in the assumptions discussed above result in a directionally similar impact to the fair value of the common stock warrant liability.

Common Stock Warrant Liability Valuation Assumptions:


	September 30, 2021			December 31, 2020
Private Placement Common Stock Warrant Liability
Stock Price	$	63.37		$	72.45
Exercise Price	$	1.12		$	1.12
Remaining term (in years)	1.54			2.28
Volatility	66.00		%	73.00		%
Risk-free interest rate	0.19		%	0.14		%

- 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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