Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2020

Stock-Based Compensation

Schedule of share-based compensation expense

	Three Months Ended
	March 31,
		2020		2019
Research and development	$	14	$	39
General and administrative		145		21
Total stock-based compensation	$	159	$	60

Schedule of weighted-average assumptions, option-pricing model

	Three Months Ended
	March 31,
	2020			2019
Expected stock price volatility		77.5	%		75.0	%
Expected life of options (years)		5.8			10.0
Expected dividend yield		0	%		0	%
Risk free interest rate		1.71	%		2.75	%