Equity (Tables)

3 Months Ended

Mar. 31, 2019

Equity [Abstract]

Summary of Stock Option Activity

A summary of stock option activity for the three months ended March 31, 2019 is as follows:

	Number of Options (in shares)			Weighted Average Exercise Price Per Share		Weighted Average Remaining Contractual Life	Aggregate Intrinsic Value
Outstanding at December 31, 2018		1,466,489		$	3.01
Granted		30,000			0.31
Exercised		—
Forfeited or expired		(73,334	)		6.55
Outstanding at March 31, 2019		1,423,155		$	2.77	1.8 years	$	25
Exercisable at March 31, 2019		1,320,655		$	2.96	1.5 years	$	24

Schedule of Stock Options Fair Value Assumptions Estimated Using Black-Scholes Pricing Model

The options granted in 2019 were to directors with an exercise price of $0.31. The fair value of the options granted was estimated on the grant date using the Black-Scholes option-pricing model with the following weighted average assumptions:

Risk-free interest rate	2.5	%
Expected term of options	3.7 years
Expected annual volatility	123	%
Expected dividend yield	—	%

Summary of Warrant Activity

The Company previously issued warrants at exercise prices equal to or greater than market value of the Company’s common stock at the date of issuance. A summary of warrant activity follows:

	Number of Warrants (in shares)		Weighted Average Exercise Price Per Share		Weighted Average Remaining Contractual Life
Outstanding at December 31, 2018		2,392,142	$	1.28
Granted		—		—
Exercised		—		—
Forfeited or expired		—		—
Outstanding at March 31, 2019		2,392,142	$	1.28		1.09 years