Accrued Expenses and Other Current Liabilities

6 Months Ended

Jun. 30, 2020

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:

(in thousands)	As of June 30, 2020		As of December 31, 2019
External research and development expenses	$	26,076	$	20,462
Payroll and related expenses	7,849		12,902
Professional fees	2,381		3,810
Revenue-related reserves	204		—
Other	823		1,542
Total accrued expenses and other current liabilities	$	37,333	$	38,716