Share-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Valuation Assumptions for Stock Options Granted

The fair value of the stock options granted during the three and six months ended June 30, 2018, was estimated on the date of grant using the Black-Scholes option pricing model with the following weighted average assumptions:

	Three months ended	Six months ended
	June 30, 2018	June 30, 2018
Expected life (years)	4.0	3.9
Expected volatility	91.3%	90.5%
Expected dividend yield	—%	—%
Risk-free interest rate	2.4%	2.4%
Weighted average fair value of options granted during the period	$0.30	$0.29

Schedule of Stock Option Activity

The following table summarizes stock option activity for the six-month period ended June 30, 2018:

	Number of Options		Weighted Average Exercise Price Per Option		Weighted Average remaining Contractual Life (years)	Aggregate Intrinsic Value (in thousands)
Outstanding balance at December 31, 2017	2,577,860		$	1.17
Granted	235,000		0.65
Forfeited and Expired	(300,000	)	0.93
Outstanding balance at June 30, 2018	2,512,860		$	1.15	8.8	$0
Options exercisable at June 30, 2018	1,247,489		$	1.62	8.4	$0