Accrued Expenses and Other Current Liabilities (Tables)

12 Months Ended

Dec. 31, 2018

Accrued Expenses and Other Current Liabilities

Schedule of accrued expenses and other current liabilities

	As of December 31
(in thousands)	2017		2018
Research and development related costs	$	2,308	$	5,032
Payroll and related costs		4,426		7,427
Accounting, tax and audit services		231		398
Other		1,159		1,645
Total other current liabilities	$	8,124	$	14,502