5. FAIR VALUE MEASUREMENTS

The Company uses the following three-tier fair value hierarchy, which prioritizes the inputs used in measuring the fair values for certain of its assets and liabilities:

Level 1 is based on observable inputs, such as quoted prices in active markets;

Level 2 is based on inputs other than the quoted prices in active markets that are observable either directly or indirectly; and

Level 3 is based on unobservable inputs in which there is little or no market data, which requires the Company to develop its own assumptions.

This hierarchy requires the Company to use observable market data, when available, and to minimize the use of unobservable inputs when determining fair value. Items measured at fair value on a recurring basis include money market funds.

The following fair value hierarchy table presents information about the Company’s financial assets measured at fair value on a recurring basis and indicates the fair value hierarchy of the inputs the Company utilized to determine such fair value (in thousands):

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The Company has determined that the estimated fair value of its corporate bonds and commercial paper are reported as Level 2 financial assets as they are based on model-driven valuations in which all significant inputs are observable, or can be derived from or corroborated by observable market data for substantially the full term of the asset.

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The fair value of the equity investment includes market price and management assumptions around the discount for the lack or marketability due to security specific characteristics. During the three and nine months ended September 30, 2021, the Company recorded an unrealized loss on the equity investment of $1.9 million in interest and other (expense) income, net in the condensed consolidated statements of operations.

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Other investments consist of investments in private companies via convertible debt instruments, which are reported as a Level 3 financial asset because the methodology used to develop the estimated fair values includes significant unobservable inputs reflecting management’s own assumptions. Assumptions used in fair valuing convertible debt instruments include the rights and obligations of the notes the Company holds as well as the probability of a qualified financing event, acquisition, or change in control. During the three and nine months ended September 30, 2021, the Company recognized gains on convertible debt instruments of $0.1 million and $0.6 million, respectively, in interest and other (expense) income, net in the condensed consolidated statements of operations.

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Company-owned life insurance contracts are recorded at their cash surrender value, which approximates fair value. These assets are measured using Level 2 inputs, based on the underlying assets of the insurance policies.

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The fair value of the Private Placement Warrants is estimated using the Black-Scholes option pricing model and is classified as a Level 3 financial instrument. The significant assumptions used in the model were the Company’s stock price, exercise price, expected term, volatility, interest rate, and dividend yield. During the three and nine months ended September 30, 2021, the Company recognized no gain and a gain of $56.6 million on the Private Placement Warrants. The Private Placement Warrants were all exercised as of March 2, 2021.

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The contingent consideration liability was valued using a Monte Carlo simulation in a risk-neutral framework as well as a scenario based approach (both special cases of the income approach), based on key inputs that are not all observable in the market and is classified as a Level 3 liability. The Company assess the fair value of the contingent consideration liability at each reporting period, with any subsequent changes to the fair value of the liability reflected in the condensed consolidated statement of operations until the liability is settled. During the three and nine months ended September 30, 2021, the Company recognized a change in fair value of contingent consideration of $0.2 million in both periods.

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There were no transfers between fair value measure levels during the nine months ended September 30, 2021 and 2020. The following table presents information about the Company’s movement in Level 3 assets measured at fair value (in thousands):

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The following table presents information about the Company’s movement in Level 3 liabilities measured at fair value (in thousands):

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In June 2021, the Company entered into a subscription agreement to purchase the equity investment in Shapeways, which resulted in an initial subscription agreement liability of $0.5 million. During the three months ended September 30, 2021, the Company recognized an additional loss in fair value of $2.4 million related to the subscription agreement liability, which was derecognized in September 2021 upon the purchase of the equity investment in Shapeways in September 2021.