Share-based compensation (Tables)

12 Months Ended

Dec. 31, 2018

Share-Based Compensation [Abstract]

Weighted-average assumptions used in determining fair value of share based awards

The Company determines the fair value of share based awards at the grant date by using the Black-Scholes option-pricing model, and is incorporating the simplified method to compute expected lives of share based awards with the following weighted-average assumptions:

Years ended December 31,	2018			2017			2016
Assumptions
Dividend yield		0	%		0	%		0	%
Risk free interest rate		2.51%-2.86	%		1.97%-2.08	%		0.%-1.0	%
Expected volatility		43%-65	%		44%-46	%		47%-53	%
Expected lives		3 years			3 years			3 years

Summary of status of company's stock option plan

A summary of the activity for the Company's Plans for the indicated periods is presented below:

Stock Option Plan Totals	Shares			Weighted Average Exercise Price
Outstanding at December 31, 2015		2,633,589		$	2.06
-Exercised		(589,725	)	$	2.43
-Granted		1,170,534		$	3.95
Outstanding at December 31, 2016		3,214,398		$	2.68
-Exercised		(1,545,161	)	$	2.27
-Granted		1,400,203		$	5.72
Outstanding at December 31, 2017		3,069,440		$	4.28
-Cancelled		(2,523,243	)	$	4.92
-Exercised		(5,000	)	$	3.43
-Granted		3,874,200		$	1.19
Outstanding at December 31, 2018		4,415,397		$	1.20

Weighted average contractual life and exercise price

The following is the weighted average contractual life in years and the weighted average exercise price at December 31, 2018 and 2017 of:

	Number of		Weighted Average Remaining Contractual	Weighted Average
2018	Options		Life	Exercise Price
Options outstanding		4,415,397	2.7 years	$	1.20
Options vested		2,258,338	2.6 years	$	1.29
Options unvested		2,157,059	2.9 years	$	1.10

	Number of		Weighted Average Remaining Contractual	Weighted Average
2017	Options		Life	Exercise Price
Options outstanding		3,069,440	2.4 years	$	4.28
Options vested		2,977,440	2.4 years	$	3.94
Options unvested		92,000	3.0 years	$	5.76

Intrinsic value

The intrinsic values of options vested and exercised during the years ended 2018, 2017 and 2016 were as follows:

	2018		2017		2016
Intrinsic value of options vested	$	0	$	462,369	$	4,843,774
Intrinsic value of options exercised	$	13,950	$	8,025,527	$	1,777,476