Share-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2020

Share-based Payment Arrangement [Abstract]

Schedule of Valuation Assumptions

The ranges for the assumptions used in the Monte Carlo model for the PRSUs granted during 2020, 2019 and 2017 are presented as follows:

	2020		2019		2017
Expected volatility	101.32% to 117.71%		49.9	%	59.63% to 62.18%
Dividend yield	0.0	%	0.0	%	0.0	%
Risk-free interest rate	0.18% to 0.51%		1.66	%	1.44% to 1.51%