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Cash, cash equivalents, and short-term marketable securities
9 Months Ended
Sep. 30, 2023
Investments, Debt and Equity Securities [Abstract]  
Cash, cash equivalents, and short-term marketable securities Cash, cash equivalents, and short-term marketable securities
Cash and cash equivalents
The following table summarizes the Company's cash, cash equivalents, and restricted cash as of September 30, 2023 and 2022.
Nine Months Ended
September 30, 2023
Nine Months Ended
September 30, 2022
(in thousands)Beginning
of period
End
of period
Beginning
of period
End
of period
Cash and cash equivalents$128,885 $186,283 $177,947 $184,082 
Restricted cash included in other assets, noncurrent478 478 478 478 
Total cash, cash equivalents and restricted cash per statement of cash flows$129,363 $186,761 $178,425 $184,560 
Marketable securities
The following tables summarize the Company's marketable securities held at September 30, 2023 and December 31, 2022.
September 30, 2023
(in thousands)Amortized
Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Fair
Value
Marketable securities
U.S. treasury securities$29,807 $13 $(9)$29,811 
U.S. government agency securities24,895 (7)24,892 
Total$54,702 $17 $(16)$54,703 
December 31, 2022
(in thousands)Amortized
Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Fair
Value
Marketable securities
U.S. treasury securities$107,964 $$(161)$107,810 
U.S. government agency securities44,016 24 (23)44,017 
Total$151,980 $31 $(184)$151,827 
All of the Company's marketable securities are due within one year or less. The Company did not realize any gains or losses recognized on the sale of marketable securities during the nine months ended September 30, 2023, and, as a result, the Company did not reclassify any amounts out of accumulated comprehensive loss.
As of September 30, 2023, the Company's debt security portfolio consisted of 5 securities that were in an unrealized loss position and had an aggregate fair value of $29.9 million. There were no securities in an unrealized loss position for greater than 12 months as of September 30, 2023. The unrealized losses on the Company's marketable securities were caused by market interest rate increases. The Company has the intent and ability to hold such securities until recovery. As a result, the Company did not record any charges for credit-related impairments for its marketable debt securities for the three months ended September 30, 2023.