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Cash and Cash Equivalents and Investments (Tables)
6 Months Ended
Jun. 30, 2023
Cash and Cash Equivalents and Investments [Abstract]  
Schedule of Cash, Cash Equivalents and Short-term Investments [Table Text Block]
 As of June 30, 2023
 Amortized CostGross Unrealized GainsGross Unrealized LossesEstimated Fair Value
 (in thousands)
Cash and cash equivalents$102,270 $$— $102,271 
Securities maturing within one year:    
U.S. treasury securities153,556 (108)153,457 
Corporate debt securities1,013 — (2)1,011 
Total short-term investments$154,569 $$(110)$154,468 
Total cash and cash equivalents and investments$256,839 $10 $(110)$256,739 
 As of December 31, 2022
 Amortized CostGross Unrealized GainsGross Unrealized LossesEstimated Fair Value
  (in thousands) 
Cash and cash equivalents$46,345 $— $— $46,345 
Securities maturing within one year:    
U.S. treasury securities74,022 — (342)73,680 
Corporate debt securities18,418 — (86)18,332 
Total short-term investments$92,440 $— $(428)$92,012 
Total cash and cash equivalents and investments
$138,785 $— $(428)$138,357