Share-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2019

Share-based Payment Arrangement [Abstract]

Schedule of Share-based Compensation Expense

The following table summarizes the components of share-based compensation expense for the years endedDecember 31, 2019 and 2018 ($ in thousands):

	Year Ended December 31,
	2019		2018
Research and development	$	274	$	446
General and administrative	1,021		2,007
Total share-based compensation expense	$	1,295	$	2,453

Total compensation cost related to unvested awards not yet recognized and the weighted-average periods over which the awards are expected to be recognized at December 31, 2019 were as follows ($ in thousands):

	Stock Options		Restricted Stock Units		Restricted Stock
Unrecognized compensation cost	$	646	$	49	$	403
Expected weighted-average period in years of compensation cost to be recognized	1.57		1.43		1.82

Schedule of Fair Value of Shares Vested and Weighted Average Estimated Fair Values of Shares Granted

Total fair value of shares vested and the weighted average estimated fair values of shares granted for the years endedDecember 31, 2019 and 2018 were as follows ($ in thousands):

	Stock Options
	Year Ended December 31,
	2019		2018
Total fair value of shares vested	$	399	$	218
Weighted average estimated fair value of shares granted	3.18		2.61

Schedule of Assumptions in Calculating Fair Values of Stock Options

The range of assumptions made in calculating the fair values of stock options was as follow:

	Stock Options
	Year Ended December 31,
	2019	2018
Expected term - minimum (in years)	6	5.5
Expected term - maximum (in years)	6	6
Expected volatility - minimum	74%	68%
Expected volatility - maximum	74%	73%
Weighted Average volatility	74%	72%
Expected dividend yield	—	—
Risk-free interest rate - minimum	2.35%	2.35%
Risk-free interest rate - maximum	2.62%	2.96%