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Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2023
Fair Value Measurements [Abstract]  
Fair Value, by Balance Sheet Grouping [Table Text Block]
 Assets and Liabilities at Fair Value as of June 30, 2023
 Level 1Level 2Level 3Total
(in thousands)
Assets
Cash and cash equivalents$102,271 $— $— $102,271 
Short-term investments153,457 1,011 — 154,468 
Total cash and cash equivalents and investments$255,728 $1,011 $— $256,739 
 Assets and Liabilities at Fair Value as of December 31, 2022
 Level 1Level 2Level 3Total
 (in thousands)
Assets
Cash and cash equivalents$46,345 $— $— $46,345 
Short-term investments73,680 18,332 — 92,012 
Total cash and cash equivalents and investments$120,025 $18,332 $— $138,357