Accrued Expenses and Other Current Liabilities (Tables)

3 Months Ended

Mar. 31, 2018

Payables And Accruals [Abstract]

Schedule of Accrued Expenses and Other Current Liabilities

	March 31, 2018		December 31, 2017
Accrued external research and development expenses	$	2,567	$	1,770
Accrued payroll and related expenses		600		1,369
Accrued professional fees		824		878
Accrued other		493		304
	$	4,484	$	4,321