Accrued Expenses and Other Current Liabilities

12 Months Ended

Dec. 31, 2018

Accrued Expenses and Other Current Liabilities

Accrued Expenses and Other Current Liabilities

7.  Accrued Expenses and Other Current Liabilities

Accrued expenses and other current liabilities include the following:

	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