Share-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2020

Share-based Payment Arrangement [Abstract]

Schedule of Share-based Compensation Expenses

Total share-based compensation expense included in the condensed consolidated statements of operations and comprehensive loss is as follows:

	Three Months Ended March 31,
	2020		2019
Research and development	$	208	$	61
General and administrative	64		153
	$	272	$	214

Summary of Stock Option Activity

Stock option activity for the three months ended March 31, 2020 is as follows:

	Shares Subject to Outstanding Options		Weighted- Average Exercise Price Per Share		Weighted- Average Remaining Contractual Term (in years)	Aggregate Intrinsic Value
Options outstanding as of December 31, 2019	1,789,303		$	3.89
Options granted	383,000		0.47
Options forfeited	(65,533	)	2.71
Options exercised	—		—
Options outstanding as of March 31, 2020	2,106,770		$	3.30	7.86	$	4