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Fair Value Measurements
 12 Months Ended
Dec. 31, 2022
Fair Value Disclosures [Abstract]  
Fair Value Measurements Fair Value Measurements
The following table represents the estimated fair value of the Company’s financial assets and liabilities (in thousands):
Fair Value at December 31, 2022Fair Value at December 31, 2021
Level 1Level 2Level 3Level 1Level 2Level 3
Assets
Money market funds (1)
$398,834 $— $—$361,822 $—$—
Government-backed securities (1)
—296,000 ——266,250 —
Corporate debt securities (1)
—— ——790,672 —
Agency securities(1)
—104,536 ——— —
Total cash equivalents$398,834 $400,536 $—$361,822 $1,056,922 $—
Liabilities
3.75% Convertible notes due 2023
$— $322,111 $—$—$447,509 $—
5.00% Convertible notes due 2027
— 172,789 ——— —
Total convertible notes payable$— $494,900 $—$—$447,509 $—
(1)All investments are classified as Cash and cash equivalents as of December 31, 2022 and 2021, on the consolidated balance sheets.

Fixed-income investments categorized as Level 2 are valued at the custodian bank by a third-party pricing vendor’s valuation models that use verifiable observable market data, such as interest rates and yield curves observable at commonly quoted intervals and credit spreads, bids provided by brokers or dealers, or quoted prices of securities with similar characteristics. Pricing of the Company’s convertible notes has been estimated using observable inputs, including the price of the Company’s common stock, implied volatility, interest rates, and credit spreads.
During the years ended December 31, 2022 and 2021, the Company did not have any transfers between Levels.
The amount in the Company’s consolidated balance sheets for accounts payable and accrued expenses approximates its fair value due to its short-term nature.