Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2019

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Stock-Based Compensation Expense Related to Company's Stock-Based Awards

The following table summarizes stock-based compensation expense related to the Company’s stock-based awards for the periods indicated (in thousands):

	Three months ended March 31,
	2019		2018
Research and development	$	156	$	164
General and administrative		216		234
Employee stock-based compensation expense		372		398
Non-employee stock-based compensation expense		45		498
Total stock-based compensation expense	$	417	$	896