Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2020

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Schedule of Assumptions Used to Calculate Fair Value of Options Granted to Employees

The fair value of stock options granted to employees during the nine months ended September 30, 2020 and 2019 was estimated at the date of grant using the following assumptions:

	Nine Months Ended September 30,
	2020			2019
Risk-free interest rate	0.2%			1.8%
Expected dividend yield		0	%		0	%
Expected term	5.3 years			5.4 years
Expected volatility	67%			67%

Schedule of Recognized Stock-Based Compensation Expense

The Company recognized stock-based compensation expense during the three and nine months ended September 30, 2020 and 2019 as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
(in thousands)	2020		2019		2020		2019
Research and development expenses	$	—	$	—	$	—	$	223
General and administrative expenses		400		703		1,348		1,561
Total stock-based compensation expenses	$	400	$	703	$	1,348	$	1,784