Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2019

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Schedule of Recognized Stock-Based Compensation Expense

The Company recognized stock-based compensation expense during the three months ended March 31, 2019 and 2018 as follows:

	Three Months Ended March 31,
(in thousands)	2019		2018
Employee awards:
Research and development expense	$	183	$	334
General and administrative expense		411		430
Total stock-based compensation expense	$	594	$	764