Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 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 and six months ended June 30, 2019 and 2018 as follows:

	Three Months Ended June 30,				Six Months Ended June 30,
(in thousands)	2019		2018		2019		2018
Employee awards:
Research and development expense	$	40	$	280	$	223	$	614
General and administrative expense		447		500		858		930
Total stock-based compensation expense	$	487	$	780	$	1,081	$	1,544