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Organization, Consolidation and Presentation of Financial Statements
3 Months Ended
Mar. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Other Consolidated Financial Statement Detail Other Consolidated Financial Statement Detail
Prepaid Expenses and Other Current Assets
Prepaid expenses and other current assets consisted of the following:
(in thousands)As of March 31, 2024As of December 31, 2023
Prepaid external research and development expenses
$12,767 $12,729 
Prepaid selling, general, and administrative expenses
8,062 5,811 
Short-term interest receivable1,413 1,772 
Other current assets1,386 1,406 
Total prepaid expenses and other current assets
$23,628 $21,718 
Accrued Expenses and Other Current Liabilities
Accrued expenses and other current liabilities consisted of the following:
(in thousands)As of March 31, 2024As of December 31, 2023
Revenue-related reserves$29,272 $26,067 
External research and development expenses16,236 16,095 
Payroll and related expenses7,918 20,519 
Professional fees6,013 5,669 
Other957 1,945 
Total accrued expenses and other current liabilities$60,396 $70,295 
Interest Income
For the three months ended March 31, 2024 and 2023, interest income was $3.6 million and $3.9 million, respectively.