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Cash, Cash Equivalents, Restricted Cash and Short-Term Investments
 6 Months Ended
Jun. 30, 2023
Investments, Debt and Equity Securities [Abstract]  
Cash, Cash Equivalents, Restricted Cash and Short-Term Investments Cash, Cash Equivalents, Restricted Cash and Short-Term Investments
As of June 30, 2023 and December 31, 2022, the Company had $350.7 million and $389.4 million, respectively of cash, cash equivalents, restricted cash and short-term investments summarized below. As of June 30, 2023 and December 31, 2022, $269.0 million and $295.2 million were available-for-sale debt securities which are carried at fair market value.
June 30, 2023
(in thousands)Amortized CostUnrealized GainsUnrealized LossesEstimated Fair Value
Cash, cash equivalents and restricted cash$81,707 $— $— $81,707 
Corporate bonds21,670 — (10)21,660 
Commercial paper154,566 — (119)154,447 
Treasury bills40,011 9 — 40,020 
Treasury bonds52,404 — (95)52,309 
Yankee bonds570 — — 570 
Total cash, cash equivalents, restricted cash and short-term investments$350,928 $9 $(224)$350,713 
December 31, 2022
(in thousands)Amortized CostUnrealized GainsUnrealized LossesEstimated Fair Value
Cash, cash equivalents and restricted cash$94,172 $— $— $94,172 
U.S. agency securities4,951 — (3)4,948 
Corporate bonds104,174 — (94)104,080 
Commercial paper125,255 — (68)125,187 
Treasury bills12,290 — (8)12,282 
Treasury bonds42,301 — (81)42,220 
Yankee bonds6,503 — (2)6,501 
Total cash, cash equivalents, restricted cash and short-term investments$389,646 $— $(256)$389,390 

As of June 30, 2023 and December 31, 2022, accrued interest receivable from the investments were $0.4 million and $1.1 million, respectively. During the three months and six months ended June 30, 2023, the Company had $32 thousand and $41 thousand unrealized losses and gains on available-for-sale securities, net of tax, respectively, which are included as a component of comprehensive loss on the consolidated statements of operations. Currently, the Company does not intend to sell investments that are in an unrealized loss position, and it is unlikely the Company will be required to sell the investments before recovery of their amortized cost basis, which may be at maturity. The Company has determined that the gross unrealized losses on investments at June 30, 2023, were temporary in nature. Realized gains or losses were immaterial during the three and six months ended June 30, 2023 and 2022.
The Company's short-term investments as of June 30, 2023 mature at various dates through March 2024.