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Accrued Expenses and Other Current Liabilities
 12 Months Ended
Dec. 31, 2019
Payables and Accruals [Abstract]  
Accrued Expenses and Other Current Liabilities . Accrued Expenses and Other Current Liabilities
Accrued expenses and other current liabilities consisted of the following:
December 31,
(in thousands)20192018
External research and development expenses$20,462  $8,761  
Payroll and related expenses12,902  4,139  
Professional fees3,810  747  
Other1,542  62  
Total accrued expenses and other current liabilities$38,716  $13,709